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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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Temperature Dependence of Magnetization Damping in Heusler Alloy Films

100%
Dubowik J., Załęski M., Głowiński H., Gościańska I.
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issue 5
848-850
EN
The Gilbert damping for Co_2CrAl (Co_2Cr_{0.3}Fe_{0.7}Al) and Ni_2MnSn Heusler alloy films was investigated as a function of temperature. The best films reveals the Gilbert damping nearly independent of temperature. Magnetic relaxation in Co_2CrAl is strongly influenced by magnetic inhomogeneities due to phase separation. The best Ni_2MnSn epitaxial films have comparable Gilbert damping α of 6× 10^{-3} as half-metallic Co_2Cr_{0.3}Fe_{0.7}Al films with α = 3 × 10^{-3}.
3
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Determination of Exchange and Rotatable Anisotropies in Co₂FeSi/IrMn Exchange Coupled Structures using Broadband Ferromagnetic Resonance

88%
Głowiński H., Schmidt M., Krysztofik A., Gościańska I., Dubowik J.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
531-533
EN
We determined exchange H_{ex} and rotatable H_{rot} anisotropy fields of multilayers that comprise 10 nm Co₂FeSi (CFS) layers exchange coupled to 20 nm IrMn layers by using ferromagnetic resonance with a vector network analyzer (VNA-FMR). The multilayer structures consist of IrMn/bottom (b)-CFS/IrMn/middle (m)-CFS/IrMn/top (t)-CFS/IrMn layers so that each CFS layer is surrounded by a pair of IrMn layers. In the structures, the exchange bias field propagates in such a way that H_{ex}^{t} > H_{ex}^{m} > H_{ex}^{b} for the top, middle, and bottom layer, respectively. FMR response measured along the exchange bias (EB) axis consist of only two absorptions related to the (b+m)- and (t)-CFS layers, respectively. Exchange and rotatable anisotropy determined independently from angular and dispersion measurements of the resonance fields are nearly the same. Rotatable anisotropy field scales with the exchange bias field in these complex structures.
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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