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- W4226185267 abstract "Epitaxial FeGa/IrMn bilayers with exchange biases along the FeGa[100] and [110] directions are prepared on MgO(001) single crystal substrates by magnetron sputtering through controlling the orientation of the external field <i>in situ</i> applied during growth. The effect of the exchange bias orientation on the magnetic switching process and the magnetic switching field are studied. The X-ray <i>φ</i>-scan indicates that the FeGa layer is epitaxially grown with a 45° in-plane rotation on the MgO(001) substrate along the FeGa(001)[110] direction and the MgO(001)[100] direction. The measurements of the angular dependence of the ferromagnetic resonance field and the corresponding fitting to the Kittel equation show that the samples have a superposition of fourfold symmetric magnetocrystalline anisotropy <inline-formula><tex-math id=M4>begin{document}$ {K}_{1} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M4.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M4.png/></alternatives></inline-formula>, unidirectional magnetic exchange bias anisotropy <inline-formula><tex-math id=M5>begin{document}$ {K}_{mathrm{e}mathrm{b}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M5.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M5.png/></alternatives></inline-formula>, and uniaxial magnetic anisotropy <inline-formula><tex-math id=M6>begin{document}$ {K}_{mathrm{u}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M6.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M6.png/></alternatives></inline-formula> with configuration of <inline-formula><tex-math id=M7>begin{document}$ {K}_{mathrm{e}mathrm{b}}//left[100right] $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M7.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M7.png/></alternatives></inline-formula> or <inline-formula><tex-math id=M8>begin{document}$ {K}_{mathrm{e}mathrm{b}}//left[110right] $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M8.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M8.png/></alternatives></inline-formula>. The combined longitudinal and transverse magneto-optical Kerr effect measurements show that sample with <inline-formula><tex-math id=M9>begin{document}$ {K}_{mathrm{e}mathrm{b}}//left[100right] $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M9.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M9.png/></alternatives></inline-formula> exhibits square loops, asymmetrically shaped loops, and one-sided two-step loops in different external magnetic field directions. In contrast, the sample with <inline-formula><tex-math id=M10>begin{document}$ {K}_{mathrm{e}mathrm{b}}//left[110right] $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M10.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M10.png/></alternatives></inline-formula> exhibits one-sided two-step and two-sided two-step loops as the magnetic field orientation changes. Because the <inline-formula><tex-math id=M11>begin{document}$ {K}_{1} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M11.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M11.png/></alternatives></inline-formula> is superimposed by <inline-formula><tex-math id=M12>begin{document}$ {K}_{mathrm{u}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M12.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M12.png/></alternatives></inline-formula> and <inline-formula><tex-math id=M13>begin{document}$ {K}_{mathrm{e}mathrm{b}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M13.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M13.png/></alternatives></inline-formula>, the in-plane fourfold symmetry of the magnetic anisotropy energy is broken. The local minima are no longer strictly along the in-plane <inline-formula><tex-math id=M14>begin{document}$ leftlangle{100}rightrangle $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M14.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M14.png/></alternatives></inline-formula> directions, but make a deviation angle which depends on the relative orientation and strength of magnetic anisotropy. A model based on the domain wall nucleation and propagation is proposed with considering the different orientations of <inline-formula><tex-math id=M15>begin{document}$ {K}_{mathrm{e}mathrm{b}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M15.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M15.png/></alternatives></inline-formula>, which can nicely explain the change of the magnetic switching route with the magnetic field orientation and fit the angular dependence of the magnetic switching fields, indicating a significant change of domain wall nucleation energy as the orientation of <inline-formula><tex-math id=M16>begin{document}$ {K}_{mathrm{e}mathrm{b}} $end{document}</tex-math><alternatives><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M16.jpg/><graphic xmlns:xlink=http://www.w3.org/1999/xlink xlink:href=12-20220166_M16.png/></alternatives></inline-formula> changes." @default.
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- W4226185267 date "2022-01-01" @default.
- W4226185267 modified "2023-10-05" @default.
- W4226185267 title "Magnetic anisotropy and reversal in epitaxial FeGa/IrMn bilayers with different orientations of exchange bias" @default.
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- W4226185267 doi "https://doi.org/10.7498/aps.71.20220166" @default.
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