Origin of perpendicular magnetic anisotropy in 
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 thin films studied by x-ray magnetic circular and linear dichroi

Okabayashi, Jun; Tanaka, Masaaki; Morishita, Masaya; Yanagihara, Hideto; Mibu, Ko

doi:10.1103/physrevb.105.134416

Cited by 7 publications

(7 citation statements)

References 64 publications

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“…In this case, the direction of strain and enhanced orbital moments are orthogonal in principle. Similar scenario can be adopted to the perpendicular MCA in Co-ferrite CoFe 2 O 4 as orbitalelastic effect in Co 2+ site with large orbital moment [75]. Second type can be understood as quadrupole cases; the direction of strain becomes an easy axis.…”

Section: Discussionmentioning

confidence: 90%

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Miura

Okabayashi

2022

J. Phys.: Condens. Matter

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Understanding magnetocrystalline anisotropy (MCA) is fundamentally important for developing novel magnetic materials. Therefore, clarifying the relationship between MCA and local physical quantities observed by spectroscopic measurements, such as the orbital and quadrupole moments, is necessary. In this review, we discuss MCA and the distortion eﬀects in magnetic materials with transition metals (TMs) based on the orbital and quadrupole moments, which are related to the spin-conserving and spin-ﬂip terms in the second-order perturbation calculations, respectively. We revealed that orbital moment stabilized the spin moment in the direction of the larger orbital moment, while the quadrupole moment stabilized the spin moment along the longitudinal direction of the spin-density distribution. The MCA of the magnetic materials with TMs and their interfaces can be determined from the competition between these two contributions. We showed that the perpendicular MCA of the facecentered cubic (fcc) Ni with tensile tetragonal distortion arose from the orbital moment anisotropy, whereas that of Mn-Ga alloys originated from the quadrupole moment of spin density. In contrast, in the Co/Pd(111) multilayer and Fe/MgO(001), both the orbital moment anisotropy and quadrupole moment of spin density at the interfaces contributed to the perpendicular MCA. Understanding the MCA of magnetic materials and interfaces based on orbital and quadrupole moments is essential to design MCA of novel magnetic applications.

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Section: Discussionmentioning

confidence: 90%

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Miura

Okabayashi

2022

J. Phys.: Condens. Matter

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“…Large XMCD signals in the Co L edge correspond to contribution of the orbital moment through the distorted Co 2+ (3d 7 ) O h site. 25,26 The Pt growth-temperature dependence of XMCD indicates the stability of Co x Fe 3−x O 4 /Pt interface structures between CFO/Pt@500 and CFO/Pt@600, except for the peak intensity ratio of Fe 2+ (O h ) components (Figure 2b). Since XAS and XMCD spectra in the TEY probe down to a depth of less than 3 nm from the sample surface, the interfacial regions can be detected clearly.…”

Section: Resultsmentioning

confidence: 99%

“…The shapes of hysteresis curves are different between 500 and 600 °C, which is consistent with the SQUID measurements. Large XMCD signals in the Co L edge correspond to contribution of the orbital moment through the distorted Co 2+ (3d 7 ) O h site. , …”

Section: Resultsmentioning

confidence: 99%

“…The XAS intensities of Co are suppressed owing to the composition ratio of 1:10, resulting in a composition of Co 0.27 Fe 2.73 O 4 with x = 0.27. The CFO with low Co composition exhibits perpendicular magnetic anisotropy (PMA). , The intensity ratio of XMCD to XAS is estimated to be 5 and 47% for the Fe and Co L 3 edges, respectively. The XAS and XMCD line shapes for Fe L edges show distinctive features due to three kinds of Fe states (Fe 3+ in O h , Fe 3+ in T d , and Fe 2+ in O h ).…”

Section: Resultsmentioning

confidence: 99%

“…Large XMCD signals in the Co L edge correspond to contribution of the orbital moment through the distorted Co 2+ (3d 7 ) O h site. 25 , 26 …”

Section: Resultsmentioning

confidence: 99%

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Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of Co_xFe_3–xO₄/Pt Grown by Molecular Beam Epitaxy

et al. 2023

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Co x Fe 3−x O 4 (CFO)/Pt bilayers prepared by molecular beam epitaxy were investigated for the anomalous Hall effect and X-ray magnetic circular dichroism (XMCD). We found that the anomalous Hall effect originates from a magnetic proximity effect at the CFO/Pt interface. The XMCD signal in the Pt L-edge was obtained only for the sample deposited at 600 °C, indicating that the magnetic proximity effect is sensitive to the interface structure. Transmission electron microscopy images of the CFO/Pt interface and XMCD measurements of Co and Fe L-edges do not provide direct evidence for interfacial atomic diffusion or alloying. In summary, these results suggest that the magnetic proximity effect is robust for transport properties, such as the anomalous Hall effect, while the induced magnetic moment depends on slight differences in the interfacial structure, such as the presence or absence of interfacial oxygen ions.

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Modulation of magnetic properties in self-assembled one-dimensional CoxFe3-xO4 nano-chains with Co substitution

Kou,

Zhang,

Chen

et al. 2024

Journal of Alloys and Compounds

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Origin of perpendicular magnetic anisotropy in CoxFe3−xO4+δ thin films studied by x-ray magnetic circular and linear dichroi

Cited by 7 publications

References 64 publications

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of Co_xFe_3–xO₄/Pt Grown by Molecular Beam Epitaxy

Modulation of magnetic properties in self-assembled one-dimensional CoxFe3-xO4 nano-chains with Co substitution

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Origin of perpendicular magnetic anisotropy in CoxFe3−xO4+δ thin films studied by x-ray magnetic circular and linear dichroi

Cited by 7 publications

References 64 publications

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Understanding magnetocrystalline anisotropy based on orbital and quadrupole moments

Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of CoxFe3–xO4/Pt Grown by Molecular Beam Epitaxy

Modulation of magnetic properties in self-assembled one-dimensional CoxFe3-xO4 nano-chains with Co substitution

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Product

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Intrinsic Magnetic Proximity Effect at the Atomically Sharp Interface of Co_xFe_3–xO₄/Pt Grown by Molecular Beam Epitaxy