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RISS 인기검색어
- 검색키워드
- 저자 : M. Coisson, (검색결과 3 건)
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S. N. Kane,M. Coisson,P. Tiberto,F. Vinai,F. Mazaleyrat 한국물리학회 2011 Current Applied Physics Vol.11 No.4
Structural and magnetic properties of Joule heated Co_64Fe_21B_15 alloy have been studied. Crystallization of the specimens starts after Joule heating with 1.6 A current, leading to the formation of nanocrystalline Co_80Fe_20 phase with grain diameter ranging between 19 and 25 nm. Crystallization of the specimens is found to detoriate the soft magnetic properties. Observed decrease of the hyperfine field of the amorphous component upon Joule heating suggests the increase of the boron near-neighbours to iron and the changes in the hyperfine field of the crystalline component are attributed to the changes in the environment around Fe atom in the specimen. The coercivity is found to obey a domain wall pinning process instead of random anisotropy, as expected in soft magnetic nanocrystalline magnetic materials.
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Microwave Properties and Anisotropy Field Distribution in Nanogranular Fe–Co–Al–O Films
Pasquale, M.,Coisson, M.,Perero, S.,Lim, S.H. IEEE 2005 IEEE transactions on magnetics Vol.41 No.10
We have investigated the microwave properties of a set of Co–Fe–Al–O films with different thicknesses. The films show a well-defined in-plane anisotropy due to the bias field applied during deposition. The resonance frequency is determined through the scattering parameters measured with a vector network analyzer and a probing station connected to a coplanar waveguide. The results show that the resonance peak features depend on the direction of the applied/RF field and on the applied field history.
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S. N. Kane,Zs. Gercsi,F. Mazaleyrat,L. K. Varga,M. Coisson,,F. Vinai,F. Celegato,Y. H. Jeong 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.6
The effect of Co addition and thermal treatments on the magnetic properties and the corresponding changes occurring in the nanostructure and magnetoimpedance in (Fe100−xCox)78Si9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 % and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 % and Si contents ranging between 7 to 25 %. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30- like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/㎥ and ~ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials. The effect of Co addition and thermal treatments on the magnetic properties and the corresponding changes occurring in the nanostructure and magnetoimpedance in (Fe100−xCox)78Si9Nb3B9Cu1 with x = 0, 20, 40, 60, 70, 75, 80, 85, 90, 95 are reported. Results show that variation in the Co content affects the stability of the alloy against crystallization and that the specimen with x = 40 exhibits highest stability against crystallization. The volume fraction of the nanograins varies between 42 to 62 % and the corresponding grain diameter ranges between 9 to 13 nm. Obtained lattice parameter values suggest that the studied samples consist of bcc Co-Fe phase with Si impurities, with Co contents ranging between 50 to 74 % and Si contents ranging between 7 to 25 %. In the studied alloys, especially above x = 70, there is a tendency to form and to stabilize a Co70Fe30- like phase. The coercive force for as-cast specimens practically does not change with increasing Co content whereas the samples annealed with and without a magnetic field exhibit appreciable changes and display similar behaviours. The coercive field is systematically lower for field-annealed samples and the abrupt increase in the coercive field for alloys with x = 70 and above is attributed to the formation of a magnetically harder Co70Fe30-like phase (as compared to the Fe80Si20 phase), which were confirmed by a decrease in the lattice parameter. The maximum values of the obtained induced anisotropy constant and the anisotropy field are, respectively, 750 J/㎥ and ~ 1250 A/m. The magnetoimpedance maximum response of the studied samples remains almost constant as a function of Co concentration for the three kinds of samples (as-cast and annealed with and without a field). However, a threefold increase in the linear range is observed for the transverse-field-annealed samples, which should increase the dynamic range of field sensors based on these new materials.
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