Mechanism of the exchange-bias field in ferromagnetic and antiferromagnetic bilayers

Mitsumata, Chiharu; Sakuma, Atsushi; Fukamichi, K.

doi:10.1103/physrevb.68.014437

Cited by 45 publications

(41 citation statements)

References 39 publications

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“…Furthermore, the LMTO band calculations including the spin-orbit interaction were performed in order to investigate the magnetocrystalline anisotropy energy (MAE) because the MAE in the antiferromagnetic materials plays an important role in the exchange biasing-field in spin valves. 21) Furthermore, the theoretical calculations of the MAE give the reason why the magnetic phase diagram of the MnPt alloy system is rather complicated, compared with that of other L1 0 -type Mn alloy systems, changing the magnetocrystalline anisotropy with the temperature or the composition.…”

Section: Introductionmentioning

confidence: 99%

“…[15][16][17][18] In order to develop the excellent properties for GMR and TMR devices, however, the investigations on fundamental magnetic properties for these practical antiferromagets have been highly desired, because the exchange biasing characteristics are closely related to the spin structures, magnetocrystalline anisotropy energy (MAE) and the magnitude of T N of the antiferromagnetic materials. [19][20][21] In addition, recent interest is how to design the devices with a low electrical resistance at room temperature, 22,23) especially in the current perpendicular to the plane (CPP)-type spin valves. [24][25][26][27] Because the antiferromagnetic layer is relatively thick, compared with other magnetic layer in the GMR and TMR devices, the reduction of its electrical resistivity is important for such devices.…”

Section: Introductionmentioning

confidence: 99%

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Electrical and Magnetic Properties, and Electronic Structures of Pseudo-Gap-Type Antiferromagnetic L10-Type MnPt Alloys

2006

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The electrical resistivity &, magnetic susceptibility 1, electronic specific heat coefficient e , the Néel temperature T N and the electronic structure and the magnetocrystalline anisotropy energy (MAE) have been investigated for L1 0 -type MnPt alloy system. This alloy system exhibits the characteristic behaviors of pseudo-gap type antiferromagnets, presenting with the highest T N , the smallest values of &, 1 and e in the vicinity of the equiatomic composition. The values of &, 1 and e increase with deviating from the equiatomic composition.From the linear muffin-tin orbital (LMTO) band calculations, the L1 0 -type MnPt alloy system has a pseudo-gap in the electronic structure and the density of states (DOS) at the Fermi energy (E F ) is lowest at the equiatomic composition in accord with the experimental results. Furthermore, the results of the LMTO band calculations including the spin-orbit interaction make it clear that the direction of the magnetic moment of Mn in the equiatomic composition is parallel to the c-axis, consistent with the reported spin structure determined by neutron diffractions. The magnetocrystalline anisotropy constant K is about 1:39 Â 10 6 J m À3 which is larger in magnitude than that of L1 0 -type MnNi equiatomic alloy, though the signs are different.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical and Magnetic Properties, and Electronic Structures of Pseudo-Gap-Type Antiferromagnetic L10-Type MnPt Alloys

2006

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“…As seen from the figure, the AFM/FM bilayer with the 1Q, 2Q or AF-1 structures only displays the coercivity in the magnetization loop without any shift. That is, only the 3Q structure can realize the loop shift caused by the unidirectional exchange-bias field 53) . At first glance, the above-mentioned model seems to be invalid for the formation of unidirectional exchange-bias field in the collinear systems.…”

Section: L10-type Mn Alloys and Exchange Couplingmentioning

confidence: 99%

“…As a Fig. 9 Spin structures in the magnetic primitive cell of the  (fcc)-phase lattice and magnetization loops of the AFM/FM bilayer for 1Q, 2Q, 3Q and AF-1 spin structures 53) .…”

Section: L10-type Mn Alloys and Exchange Couplingmentioning

confidence: 99%

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Basic and Applied Research of Transition-metal Based Magnetic Materials

Fukamichi

2017

J. Magn. Soc. Jpn.

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Various transition-metal magnetic materials have been investigated from basic and practical viewpoints. The concentration dependence of the Néel temperature T N of Cr-based alloys is complicated. Cr-Si and Cr-Fe antiferromagnetic alloys show Invar characteristics in the ternary alloys. Fe-based amorphous alloys exhibit weak ferromagnetic properties, resulting in remarkable magnetovolume effects.The icosahedral quasicrystals containing Mn show a spin-glass behavior, in a similar manner as those of amorphous counterparts. Itinerant-electron metamagnetic transition occurs in La(FexSi1-x)13, accompanied by many drastic change in magnetic and elastic properties. These drastic changes are practically useful in the field magnetic refrigeration and linear magnetostriction. The magnitude of T N of Mn-based -phase is increased by addition of Ir, Ru, Rh and the spin structures change, depending on temperature and composition. Several kinds of L10-type Mn alloys have a high value of T N with a large magnetocrystalline anisotropy. The shift of the exchange-bias field for the collinear spin structure in L10-type phase is induced by spin frustration. L21-and B2-type Co2CrGa metallurgical stable alloys exhibit a high spin polarization. Several kinds of L21-type and B2-type alloys show a large ferromagnetic shape memory effect associated with twin-boundary motions.

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New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

et al. 2021

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condensed matter physics, including cell membranes, [1] nematic crystals, [2,3] superfluids, [4] semiconductors, [5][6][7][8] ferromagnets, [9] and superconductors. [10,11] Currently, much attention is paid to strongly correlated electronic systems, for example, ferromagnets and superconductors, as they provide a unique tool to manipulate the topology of coexisting vector and scalar fields, associated with geometries of conventional systems.Until recently, in the case of magnetism, the influence of the geometry on the spin vector fields was addressed primarily by the design of the sample boundaries. This approach naturally brings the shape anisotropy to the system and leads to the formation of specific spin textures, for example, magnetic vortices [12] and antivortices [13] as well as provides control over the dynamics of the topologically nontrivial magnetic solitons. [14][15][16][17][18] This discussion also tackles the state of the art in modern experimental antiferromagnetism, where the design of the sample topography and boundaries allows to control the domain wall states. [19][20][21][22] With the development of novel fabrication techniques allowing to realize complex 3D architectures, not only the boundary effects but also the extrinsic geometrical properties (e.g., local curvatures) can be addressed rigorously for the case of ferromagnets [23][24][25][26][27] as well as superconductors. [28][29][30] The explored effects are directly related to the interplay between the Traditionally, the primary field, where curvature has been at the heart of research, is the theory of general relativity. In recent studies, however, the impact of curvilinear geometry enters various disciplines, ranging from solid-state physics over soft-matter physics, chemistry, and biology to mathematics, giving rise to a plethora of emerging domains such as curvilinear nematics, curvilinear studies of cell biology, curvilinear semiconductors, superfluidity, optics, 2D van der Waals materials, plasmonics, magnetism, and superconductivity. Here, the state of the art is summarized and prospects for future research in curvilinear solid-state systems exhibiting such fundamental cooperative phenomena as ferromagnetism, antiferromagnetism, and superconductivity are outlined. Highlighting the recent developments and current challenges in theory, fabrication, and characterization of curvilinear micro-and nanostructures, special attention is paid to perspective research directions entailing new physics and to their strong application potential. Overall, the perspective is aimed at crossing the boundaries between the magnetism and superconductivity communities and drawing attention to the conceptual aspects of how extension of structures into the third dimension and curvilinear geometry can modify existing and aid launching novel functionalities. In addition, the perspective should stimulate the development and dissemination of research and development oriented techniques to facilitate rapid transitions from laboratory demonstrations to industry-...

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Mechanism of the exchange-bias field in ferromagnetic and antiferromagnetic bilayers

Cited by 45 publications

References 39 publications

Electrical and Magnetic Properties, and Electronic Structures of Pseudo-Gap-Type Antiferromagnetic <I>L</I>1<SUB>0</SUB>-Type MnPt Alloys

Electrical and Magnetic Properties, and Electronic Structures of Pseudo-Gap-Type Antiferromagnetic <I>L</I>1<SUB>0</SUB>-Type MnPt Alloys

Basic and Applied Research of Transition-metal Based Magnetic Materials

New Dimension in Magnetism and Superconductivity: 3D and Curvilinear Nanoarchitectures

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