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Wyświetlanie 1-15 z 17
Tytuł:
Multilayer Structures with Giant Magnetoresistance
Autorzy:
Stobiecki, F.
Stobiecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/2035457.pdf
Data publikacji:
2002-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
75.70.-i
Opis:
The phenomenological description of the giant magnetoresistance effect as well as the discussion of the requirements which must be fulfilled in giant magnetoresistance thin film structures are given in the first part of our review. In the second part the magnetization reversal and giant magnetoresistance effect of antiferromagnetically coupled multilayers, spin valve and pseudo-spin valve thin film structures are explained. For these structures we also discuss the influence of the structure defects such as surface roughness and pinholes on the giant magnetoresistance effect.
Źródło:
Acta Physica Polonica A; 2002, 102, 1; 95-108
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spin-Wave Excitations and Fluctuations of the Exchange Interaction in Amorphous Fe$\text{}_{1-x}$Zr$\text{}_{x}$ Alloys
Autorzy:
Kossacki, P.
Stobiecki, T.
Szymczak, H.
Powiązania:
https://bibliotekanauki.pl/articles/1929351.pdf
Data publikacji:
1993-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Cr
75.50.Kj
75.70.-i
Opis:
Detailed magnetization measurements were performed on amorphous Fe$\text{}_{1-x}$Zr$\text{}_{x}$ alloys with 0.14 ≤ x ≤ 0.48 at temperatures ranging from 4.2 K to the Curie temperature in external magnetic field up to 5 T. An analysis of the experimental data reveals that' the fluctuations of the exchange integral resulting from the structural disorder give important contribution to the thermal demagnetization and high-field susceptibility of Fe-rich alloys. For Zr-rich alloys the effect of fluctuations of the exchange integral is negligible and thermal demagnetization is described in terms of spin-wave excitations. No Stoner single-particle excitations were observed for alloys with x > 0.14.
Źródło:
Acta Physica Polonica A; 1993, 83, 6; 785-791
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magnetic Field Sensor Based on Magnetic Tunnel Junction with Voltage-Tunable Magnetic Anisotropy
Autorzy:
Skowroński, W.
Wiśniowski, P.
Wrona, J.
Żywczak, A.
Stobiecki, T.
Powiązania:
https://bibliotekanauki.pl/articles/1386807.pdf
Data publikacji:
2015-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
85.75.-d
85.75.Ss
85.35.-p
Opis:
We present a submicron magnetic field sensor with voltage-tunable magnetic field sensitivity. The device, based on magnetic tunnel junction, exhibits high tunnelling magnetoresistance ratio of up to 90%. Perpendicular magnetic anisotropy of thin ferromagnetic sensing layer in combination with an in-plane magnetized reference layer is used to obtain linear change in the sensor resistance in response to the in-plane magnetic field. The perpendicular anisotropy is further controlled by the bias voltage and, thus, the sensitivity of the sensor is changed. In addition, we evaluate the sensor selectivity for the magnetic field direction and present an influence of the temperature on the anisotropy.
Źródło:
Acta Physica Polonica A; 2015, 127, 2; 496-498
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Prototype Silicon Position-Sensitive Detector Working with Bragg-Brentano Powder Diffractometer
Autorzy:
Zięba, A.
Dąbrowski, W.
Gryboś, P.
Powroźnik, W.
Stobiecki, T.
Świentek, K.
Słowik, J.
Wiącek, P.
Powiązania:
https://bibliotekanauki.pl/articles/2030562.pdf
Data publikacji:
2002-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
07.85.-m
29.40.Wk
Opis:
A prototype 64-channel detector module, comprising a silicon strip detector with strip pitch of 100μm and 64-channel ASIC RX64, was tested with the X-Pert Philips MPD diffractometer. Basic parameters of the detector module, energy resolution, and detection efficiency, were evaluated as a function of the counting rate. Energy resolution of 1.1 keV FWHM for photon rate up to 1×10$\text{}^{7}$ photon/s per 1 cm of the active width of the detector was demonstrated. The prototype detector, when applied in a diffractometer utilizing Bragg-Brentano focusing principle, allows to increase the counting rate by about 2 orders of magnitude with respect to a single counter. Exemplary diffraction patterns of polycrystalline samples of Si and SiO$\text{}_{2}$ (quartz peak cluster) are presented.
Źródło:
Acta Physica Polonica A; 2002, 101, 5; 629-634
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Temperature Dependence of Magnetisation Reversal and GMR in Spin Valve Structures
Autorzy:
Stobiecki, F.
Stobiecki, T.
Ocker, B.
Maass, W.
Powroźnik, W.
Paja, A.
Loch, C.
Röll, K.
Powiązania:
https://bibliotekanauki.pl/articles/2013156.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Pa
68.55.Ln
68.55.-a
Opis:
Temperature measurements of magnetisation reversal, resistance and magnetoresistance of Co/Cu/Co/FeMn spin valve structures deposited in different conditions were performed. The influence of exchange anisotropy energy, interlayer coupling energy, and electron transport properties were taken into consideration in explaining differences in giant magnetoresistance effect of investigated samples.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 523-526
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Resistivity and Temperature Coefficient of Resistivity of the Fe/Zr Multilayer Films
Autorzy:
Luciński, T.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/1930608.pdf
Data publikacji:
1994-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.-y
Opis:
The resistivity (ρ) and temperature coefficient of resistivity (TCR) dependencies on modulation wavelength (λ) were examined in Fe/Zr multi-layer thin films. It was shown that the ρ(λ) and TCR(λ) behaviours can be explained on the basis of the assumption that the amorphous phase can be spontaneously formed during the deposition process. We found that the effective thickness of the amorphous phase was ≈2 nm per single interface.
Źródło:
Acta Physica Polonica A; 1994, 85, 2; 443-447
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Giant Magnetoresistance in Permalloy/Copper Multilayers
Autorzy:
Luciński, T.
Stobiecki, F.
Powiązania:
https://bibliotekanauki.pl/articles/1955449.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Jt
75.70.Cn
Opis:
The oscillatory behaviour of the giant magnetoresistivity versus Cu sublayer thickness was observed in Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayers with an oscillation period of 1 nm independently of buffer layer and substrates used in the experiment. The giant magnetoresistance field sensitivity equal to 0.02%/Oe and 0.15%/Oe for the first and the second maximum respectively, were found. It was shown that the giant magnetoresistance effect in our multilayers is not only due to the antiferromagnetic coupling between adjacent permalloy layers but also due to the superparamagnetic-like behaviour related to the existence of the intermixed interfacial areas.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 273-275
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structure and Magnetic Properties of Ni/Ti Multilayers
Autorzy:
Szymański, B.
Stobiecki, F.
Otto, T.
Röll, K.
Powiązania:
https://bibliotekanauki.pl/articles/1953189.pdf
Data publikacji:
1997-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.70.-i
Opis:
We report a study of structure and magnetic properties of Ni/Ti multilayers with different modulation wavelength, 10 nm ≤ λ ≤ 40 nm, and constant sublayers thickness ratio d$\text{}_{Ni}$/d$\text{}_{Ti}$=1. Specimens were characterized with X-ray diffraction, vibrating sample magnetometer and torque meter in as-deposited state and in successive stages of isothermal annealing at 423 K. Hysteresis curves of as-deposited samples revealed the typical feature of ferromagnetic films with predominant shape anisotropy. During annealing very pronounced changes in the hysteresis loops were observed. An analysis of the loops indicates the occurrence of distinct changes in magnetic anisotropy of Ni sublayers: their effective shape anisotropy is drastically reduced due to a development of the perpendicular anisotropy and/or a modification of the microstructure. The effect can possibly be applied to achieve desirable variation of perpendicular anisotropy in multilayers which consist of Ni sublayers.
Źródło:
Acta Physica Polonica A; 1997, 91, 1; 233-236
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superparamagnetic Grains as Source of Giant Magnetoresistance Effect in Discontinuous Co/Ag Multilayers
Autorzy:
Luciński, T.
Stobiecki, F.
Dubowik, J.
Czajka, R.
Powiązania:
https://bibliotekanauki.pl/articles/1955447.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Cn
Opis:
The as-deposited and annealed Co/Ag discontinuous multilayer-like structures were examined. Discontinuous Co sublayers are thought to consist of fine superparamagnetic and ferromagnetic grains. Using the bimodal superparamagnetic grain sizes distribution the GMR(H) dependencies were successfully modelled with the use of two Langevin functions simulating the magnetization of the superparamagnetic grains.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 269-272
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Néels Magnetostatic Coupling in Sputtered Cu/Py/V/Py/MnIr/Cu Multilayers
Autorzy:
Urbaniak, M.
Brückl, H.
Stobiecki, F.
Luciński, T.
Reiss, G.
Powiązania:
https://bibliotekanauki.pl/articles/2037183.pdf
Data publikacji:
2004-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Cn
68.65.Ac
Opis:
The correlation between magnetostatic or Néel's coupling and roughness of interfaces in sputtered Cu/Py/V/Py/MnIr/Cu multilayers was investigated with the help of atomic force microscopy and magnetometry. It is shown that the coupling strongly depends on the roughness of seed Cu layer which in turn depends on sputtering power. Roughness levels off after deposition of consecutive layers to about 0.2 nm rms.
Źródło:
Acta Physica Polonica A; 2004, 105, 3; 307-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Smoke emission of AD3.152 engine fuelled with rapeseed oil/diethyl ether blends
Zadymienie spalin silnika AD3.152 zasilanego mieszaninami oleju rzepakowego i eteru dietylowego
Autorzy:
Lotko, W.
Hernik, A.
Stobiecki, J.
Kosmanis, T.
Górska, M.
Powiązania:
https://bibliotekanauki.pl/articles/1363331.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
Tematy:
diethyl ether
rapeseed oil
biofuels
renewable fuels
diesel engine
eter dietylowy
olej rzepakowy
biopaliwa
odnawialne paliwa
silnik diesla
Opis:
The paper presents research results on smoke emission from AD3.152 diesel engine fuelled with rapeseed oil (RO) and its blends with diethyl ether (DEE). All necessary tests were carried out in stationary condition for selected rotational speeds of the crankshaft i.e.1000, 1500 and 2000 rpm as well as engine loads of 40, 80 and 120 Nm. Results of the research confirmed, that diethyl ether added in volumetric ratio of 40 % to rapeseed oil reduces smoke opacity even by 50% compared with the engine fuelled with neat rapeseed oil.
W artykule przedstawiono wyniki badań zadymienia spalin silnika o zapłonie samoczynnym AD3.152 zasilanego olejem rzepakowym (OR)oraz jego mieszaninami z eterem dietylowym (DEE). Wszystkie niezbędne badania wykonano w warunkach ustalonych dla wybranych prędkości obrotowych wału korbowego tj. 1000, 1500 i 2000 obr/min oraz obciążeń 40, 80 i 120 Nm. Uzyskane wyniki potwierdzają, że dodatek eteru dietylowego w objętości 40% do oleju rzepakowego zmniejsza zadymienie spalin nawet o ok. 50% w stosunku do silnika zasilanego olejem rzepakowym.
Źródło:
Archiwum Motoryzacji; 2018, 80, 2; 65-76
1234-754X
2084-476X
Pojawia się w:
Archiwum Motoryzacji
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Temperature and Annealing on GMR in Sputtered Permalloy/Cu Multilayers
Autorzy:
Urbaniak, M.
Stobiecki, F.
Luciński, T.
Kopcewicz, M.
Grabias, A.
Aleksiejew, J.
Powiązania:
https://bibliotekanauki.pl/articles/2013168.pdf
Data publikacji:
2000-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Ak
75.70.Pa
Opis:
The influence of temperature and annealing on giant magnetoresistance of Si(100)/Cu(20 nm)/Py(2 nm)/(Cu(2 nm)/Py(2 nm))$\text{}_{100}$ multilayer (Py = Ni$\text{}_{83}$Fe$\text{}_{17}$) sputtered at room temperature in double face-to-face configuration is reported. It was found that giant magnetoresistance value, ΔR$\text{}_{GMR}$/R$\text{}_{sat}$ (where R$\text{}_{sat}$ is the resistance in saturation), monotonically decreases with increasing temperature (4.5% at 173 K to about 1% at 373 K). This results from the decrease in magnetic change of resistance, ΔR$\text{}_{GMR}$, and to the lesser extent from an increase in R$\text{}_{sat}$, though both of them are caused by the shortening of electrons mean free path. The observed almost linear decrease in giant magnetoresistance saturation field with increasing temperature is explained by temperature changes of magnetization profile. Vibrating sample magnetometer measurements revealed that the increase in temperature results in pronounced decrease in remnant to saturation magnetization ratio (M$\text{}_{r}$/M$\text{}_{s}$) suggesting that at low temperatures magnetic bridges between Py layers play an important role in magnetization process. It is shown that proper annealing, by an annihilation of bridges and/or lateral decoupling, leads to an increase in giant magnetoresistance ratio from 3.4% in as deposited state to 4.7%.
Źródło:
Acta Physica Polonica A; 2000, 97, 3; 539-542
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High-Quality Ni-Fe/Cu Multilayer Films with Antiferromagnetic Coupling
Autorzy:
Stobiecki, F.
Dubowik, J.
Luciński, T.
Szymański, B.
Rohrmann, H.
Röll, K.
Schmidt, M.
Powiązania:
https://bibliotekanauki.pl/articles/1955455.pdf
Data publikacji:
1997-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Tt
76.50.+g
Opis:
We report structural and magnetic properties of Ni$\text{}_{83}$Fe$\text{}_{17}$/Cu multilayer films with various buffer layer and sublayer thicknesses of copper d$\text{}_{Cu}$ and Permalloy d$\text{}_{Py}$ deposited by face-to-face sputtering. The following features prove a good quality of our films: a well-layered structure, complete antiferromagnetic coupling with a low coupling strength (2×10$\text{}^{-5}$ J/m$\text{}^{2}$ for d$\text{}_{Cu}$=1 nm and 10$\text{}^{-6}$ J/m$\text{}^{^2}$ for d$\text{}_{Cu}$=2.1 nm) and a low coercive field which make them attractive for possible applications as giant magnetoresistance sensors.
Źródło:
Acta Physica Polonica A; 1997, 91, 2; 277-280
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hard and Soft X-Ray Reflectivity Studies οf $(NiFe//Au//Co//Au)_{10}$ Magnetic Multilayers
Autorzy:
Szymański, B.
Stobiecki, F.
Weis, T.
Engel, D.
Urbaniak, M.
Kuświk, P.
Lengemann, D.
Ehresmann, A.
Powiązania:
https://bibliotekanauki.pl/articles/1810593.pdf
Data publikacji:
2009-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.05.cm
75.60.-d
75.70.-i
Opis:
We report on hard and soft X-ray reflectivity investigations of $(Ni_{80}Fe_{20} (2.2 nm)//Au(2.3 nm)//Co(0.8 nm)//Au(2.3 nm))_{10}$ multilayers. Specular reflectivity curves were measured with Cu $K_{α}$ radiation and circularly polarized synchrotron radiation tuned to Co $L_{3}$ and Ni $L_{3}$ absorption edges. Structural properties of the multilayers were determined from the hard X-ray reflectivity curve. Comparison of reflectivity curves taken at different photon energies shows: (i) small difference in peak positions in dependence of reflectivity versus scattering vector q, (ii) different shapes of satellite Bragg peaks, (iii) different ranges of q for appearance of the Kiessig fringes. Analysis of soft X-ray reflectivity curves taken as a function of magnetic field allows to determine magnetic properties of Co and NiFe layer specifically.
Źródło:
Acta Physica Polonica A; 2009, 115, 1; 366-368
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
He⁺ Ion Bombardment Induced Effects on Magnetic Properties of Ni-Fe/Au/Co/Au Films
Autorzy:
Kuświk, P.
Szymański, B.
Urbaniak, M.
Dubowik, J.
Stobiecki, F.
Kisielewski, J.
Tekielak, M.
Maziewski, A.
Weis, T.
Ehresmann, A.
Powiązania:
https://bibliotekanauki.pl/articles/1813489.pdf
Data publikacji:
2008-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.30.Gw
75.50.Sc
Opis:
The influence of He⁺ (10 keV) ion bombardment on magnetic properties of sputter deposited $Ni_{80}Fe_{20}$/Au/Co/Au layered films was studied. The variable parameters were the thickness of the Co layer or Au spacer and the ion dose. The magnetooptical Kerr measurements were performed on samples with wedge shaped Co or Au layers. With increasing dose of helium ions the following changes in magnetic properties were observed: (i) a decrease in the Co thickness range corresponding to the perpendicular anisotropy, (ii) a decrease in the coercive field $(H_C)$, (iii) an increase in the ferromagnetic coupling between ferromagnetic layers.
Źródło:
Acta Physica Polonica A; 2008, 113, 2; 651-656
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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