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Exchange Coupled NiFe/NiMn Bilayer Studied by a Vector Network Analyzer Ferromagnetic Resonance

100%
Głowiński H., Załęski K., Sprada J., Dubowik J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1145-1147
EN
Using cavity ferromagnetic resonance and vector network analyzer ferromagnetic resonance unidirectional, uniaxial and rotatable anisotropies were determined in permalloy(30 nm)/NiMn(56 nm). Resonance field dependence on in-plane angle clearly shows unidirectional and uniaxial anisotropy. Rotatable anisotropy, which acts as internal magnetic field independent of a direction of external magnetic field, is observed on vector network analyzer ferromagnetic resonance as upward shift of the resonance frequency of Py/NiMn compared to Py film. Even for a small exchange bias field, this shift is significantly large.
2
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Electric and Magnetic Signatures of Structural and Chemical Ordering of Heusler Alloy Films

88%
Dubowik J., Gościańska I., Załęski K., Kudryavtsev Y., Lee Y.
Acta Physica Polonica A
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2009
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vol. 115
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issue 1
360-362
EN
We present results of in situ temperature measurements of resistivity for some amorphous or partially crystalline Heusler alloy films: Co_{2}CrAl, Co_{2}MnGa and off-stoichiometric Ni_{2}Mn_{1+x}Sn_{x}, Ni_{2}Mn_{1-x}Ga_{x} that are known to exhibit half-metallic properties and martensitic transformations, respectively. From ρ vs. T characteristics we distinguish various stages of chemical and structural ordering in the films. They appear to be quite distinct in both systems investigated. The resistivity results are compared with magnetic characteristics for Co_{2}MnGa with a high Curie temperature.
3
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Ultrafast Magnetization Dynamics in Epitaxial Ni-Mn-Sn Heusler Alloy Film

88%
Bonda A., Uba S., Załęski K., Dubowik J., Uba L.
Acta Physica Polonica A
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2018
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vol. 133
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issue 3
501-504
EN
The work is devoted to studies of ultrafast magnetization dynamics induced by femtosecond laser pulses in ferromagnetic Ni-Mn-Sn shape memory Heusler alloy. We studied epitaxial thin Ni_{54.3}Mn_{31.9}Sn_{13.8} film deposited on (001) MgO substrate. Spin precession in an external magnetic field was triggered and detected by the time-resolved magneto-optical Kerr effect (TRMOKE) using pump-probe technique in dual color scheme experiment. Measurements were performed as a function of magnetic field H and pulse power P. The measured TRMOKE signal is composed of oscillatory and background components, both decaying exponentially in a nanosecond time scale. The precession frequency was determined and found to be varying in the range of 1-10 GHz with H up to 3 kOe and decreasing linearly with P. The dependence of Gilbert damping parameter α on H was determined and discussed.
4
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Exchange Bias in Ni-Mn-Sn Heusler Alloy Films

88%
Gościańska I., Załęski K., Głowiński H., Kudryavtsev Y., Dubowik J.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1179-1181
EN
We report a relatively large exchange bias effect observed for the first time in Ni-Mn-Sn thin films with different microstructure and composition: a Ni_{50}Mn_{36}Sn_{14} epitaxial film (A), a Ni_{50}Mn_{43}Sn_7 film which is phase decomposed (B), and a NiMn/Ni_{50}Mn_{25}Sn_{25} bilayer (C). Despite the samples differ markedly in both microstructure and composition H_{EB} does not substantially differs at 5 K. Exchange bias decreases with increasing T approximately as H_{EB} (T) ∝ H_{EB} (5K)/T with H_{EB} (5K) of 180 Oe and 60 Oe for sample B and C, respectively and almost linearly for sample A with H_{EB} (5K) = 65 Oe. Blocking temperature where the exchange bias vanishes is 40, 50 and 80 K for sample A, C and B, respectively. The results suggest that the role of AFM/FM interfaces is not substantial in formation of exchange bias in Ni-Mn-Sn Heusler alloy films and exchange bias is rather related to AFM/FM interactions in nanoscale.
5
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Epitaxial Growths and Magnetization Dynamics of Ni_{2}MnSn Heusler Alloy Films

76%
Dubowik J., Gościańska I., Załęski K., Głowiński H., Ehresmann A., Kakazei G., Bunyaev S.
Acta Physica Polonica A
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2012
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vol. 121
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issue 5-6
1121-1123
EN
Ferromagnetic resonance has been investigated in Ni_{2}MnSn Heusler alloy films. The films were deposited at 673
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