Journal ArticleDOI
Systematic Study for Magnetization Dependence of Exchange Anisotropy Strength in Mn-Ir/FM (FM ${=}$ Ni-Co, Co-Fe, Fe-Ni) Bilayer System
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In this article, the unidirectional anisotropy constant of the Mn76Ir24/FM bilayers was investigated, systematically changing the FM layer composition, and it was found that body centered cubic (bcc) structures are more likely to induce strong exchange anisotropic than fcc structured FM layers.Abstract:
The unidirectional anisotropy constant, JK, of the Mn76Ir24/FM (FM =Ni-Co, Co-Fe, Fe-Ni) bilayers was investigated, systematically changing the FM layer composition. On the (111)-oriented face centered cubic (fcc) Mn-Ir layer, the FM layers were grown in the respective crystal structure, corresponding to their composition. The phase boundaries between fcc and body centered cubic (bcc) structures existed around Co80Fe20 and Fe70Ni30, roughly corresponding to those in the bulk binary alloy systems. The saturation magnetization, Ms, of the FM layer showed a broad peak around Fe60Co40 and a shallow dip at Fe70Ni30 , corresponding well with the Slater-Pauling curve of bulk alloys. On the other hand, the JK reached a maximum around Co70Fe30 and showed different variation from that of the Ms against the FM layer composition. Therefore, the correlation plot between JK and Ms did not provide any clear relationship. From the experimental results, we found a general feature that bcc structured FM layers are more likely to induce strong exchange anisotropy than fcc structured FM layers.read more
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Journal ArticleDOI
Uncompensated antiferromagnetic moments in Mn-Ir/FM (FM = Ni-Co, Co-Fe, Fe-Ni) bilayers: Compositional dependence and its origin
Hirokazu Takahashi,Yohei Kota,Masakiyo Tsunoda,Tetsuya Nakamura,Kenji Kodama,Akimasa Sakuma,Migaku Takahashi +6 more
TL;DR: In this paper, the magnetic moments of Mn and other ferromagnetic atoms near the AF/FM interface were analyzed using the x-ray magnetic circular dichroism technique in bilayer bilayers.
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Physics and Design of Hard Disk Drive Magnetic Recording Read Heads
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In-plane and perpendicular exchange bias effect induced by an antiferromagnetic D019 Mn2FeGa thin film
Takahiro Ogasawara,Takahiro Ogasawara,Edward Alan Jackson,Masakiyo Tsunoda,Yasuo Ando,Atsufumi Hirohata +5 more
TL;DR: Kundu et al. as discussed by the authors measured in-plane and perpendicular Hex induced by (Mn,Fe)3Ga are generated by a spin structural change from noncollinear to noncoplaner in ab-plane.
Journal ArticleDOI
Magnetization reversal asymmetry in [Co/Pt]/CoFe/IrMn multilayers with enhanced perpendicular exchange bias
TL;DR: In this paper, the magnetization reversal of perpendicular exchange biased [Co/Pt]/Co60Fe40/IrMn multilayers was investigated by time-resolved surface magneto-optical Kerr effect and Kerr microscopy.
Journal ArticleDOI
Perpendicular Exchange Anisotropy in Mn-Ir/Fe-Co/[Pt/Co] $_{4}$ Multilayers
TL;DR: In this article, the authors compared the perpendicular exchange anisotropy and in-plane exchange aisotropic constant of Mn-Ir/Fe-Co/[Pt/Co] 4 multilayers by systematically changing the Fe-Co layer composition.
References
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Journal ArticleDOI
Random-field model of exchange anisotropy at rough ferromagnetic-antiferromagnetic interfaces.
TL;DR: In this article, a field-asymmetric offset of the hysteresis loop in ferromagnetic-antiferromagnetic sandwiches, one of the manifestations of exchange anisotropy, can be predicted from the presence of random interface roughness giving rise to a random field acting on the interface spins.
Journal ArticleDOI
Simple model for thin ferromagnetic films exchange coupled to an antiferromagnetic substrate
TL;DR: In this article, the authors show that the exchange field of a thin exchange coupled ferromagnetic film reaches a limiting value no matter how large the exchange coupling is, due to domain wall formation in the antiferromagnet.
Journal ArticleDOI
Extra large unidirectional anisotropy constant of Co–Fe/Mn–Ir bilayers with ultra-thin antiferromagnetic layer
TL;DR: In this paper, the unidirectional anisotropy constant (JK) of Co1−xFex/Mn-Ir bilayer was investigated as a function of the Fe concentration.
Journal ArticleDOI
Exchange coupling mechanisms at ferromagnetic/CoO interfaces
Journal ArticleDOI
Dependence of exchange coupling on magnetization in Co-Ni/FeMn bilayers
TL;DR: In this paper, the characteristics of exchange bias in Co-Ni/FeMn bilayers with a fixed FeMn thickness of 150 \AA{} but CoNi layer with different magnetizations by varying its composition were determined.
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