Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

Okabayashi, Jun; Miura, Yoshio; Kota, Yohei; Suzuki, Kazuya; Sakuma, Atsushi; Mizukami, Shigemi

doi:10.1038/s41598-020-66432-9

Cited by 20 publications

(13 citation statements)

References 42 publications

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“…However, the anisotropy direction of transition metal and rare earth based spin pumping are coupled to the crystal field anisotropy direction and orbital moment direction, respectively [36]. Furthermore, the hyperfine-interaction-induced quadrupole anisotropy (of the neglected term) may contribute to the observed large magnetic anisotropy of manganese alloys [37].…”

Section: Anisotropic Hyperfine Interaction Between Nuclear and Conduction Spinmentioning

confidence: 99%

Antiferromagnetic spin pumping via hyperfine interaction

Cahaya

2021

Hyperfine Interact

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Spin pumping is an interfacial spin current generation from the ferromagnetic layer to the non-magnetic metal at its interface. The polarization of the pumped spin current s ∝ × ̇ depends on the dynamics of the magnetic moment . When the materials are based on light transition metals, mechanism behind the spin current transfer is dominated by the exchange interaction between spin of localized d-electrons and itinerant conduction electrons. In heavier transition metals, however, the interaction is not limited to the exchange interaction. The spin of the conduction electron can interact to its nuclear spin by means of hyperfine interaction, as observed in the shift of NMR frequency. By studying the spin polarization of conduction electron of the non-magnetic metallic layer due to a nuclear magnetic moment of the ferromagnetic layer, we show that the hyperfine interaction can mediate the spin pumping. The polarization of the spin current generation is shown to have a similar form J s ∝ × ̇ .

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Section: Anisotropic Hyperfine Interaction Between Nuclear and Conduction Spinmentioning

confidence: 99%

Antiferromagnetic spin pumping via hyperfine interaction

Cahaya

2021

Hyperfine Interact

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“…20,27) Recently, Okabayashi et al revealed that orbital magnetic moments and anisotropies for Mn 3 Ga are low by combining the X-ray magnetic circular/linear dichroism (XMCD/XMLD) and theoretical calculations, whereas there is a band mixing between the Mn-3d up-and down-spin states, resulting a significant MA. 28) Because the MnAlGe has a simple ferromagnetic structure and only one kind of Mn atomic site, the investigations on the origin of the large MA energy will be an interesting research subject as one of the Mn-based alloy systems.…”

Section: Substrate Heating Temperature Effects On the Magnetic Properties Of Mnalge Filmmentioning

confidence: 99%

Microstructure, Morphology and Magnetic Property of (001)-Textured MnAlGe Films on Si/SiO<sub>2</sub> Substrate

et al. 2021

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Substrate heating effects on the microstructure and magnetic properties of MnAlGe films grown on Si/SiO 2 substrate by sputtering system were investigated. The MnAlGe film fabricated by low-temperature substrate heating demonstrated amorphous phase and paramagnetic property. The film of c-axis orientation associated with the Cu 2 Sb-type structure was obtained by sputtering at a substrate heating temperature of 270°C and it exhibited perpendicular magnetic anisotropy. From the magnetization curves measured at room temperature, the uniaxial magnetic anisotropy energy, K u , was evaluated to be in the order of 10 6 erg/cm 3 , which is consistent with the literature, although the heating processing and temperature are slightly different. Microstructural observation indicated that the c-axis oriented grains were isolated in the matrix of the amorphous phase. The film lost the c-axis orientation at elevated substrate heating temperature, resulting in loss of the anisotropic magnetic property.

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“…However, the anisotropy direction of transition metal and rare earth based spin pumping are coupled to the crystal field anisotropy direction and orbital moment direction, respectively [36]. Furthermore, the hyperfine-interaction-induced quadrupole anisotropy (of the neglected I term) may contribute to the observed large magnetic anisotropy of manganese alloys [37].…”

Section: Anisotropic Hyperfine Interaction Between Nuclear and Conduc...mentioning

confidence: 99%

Antiferromagnetic spin pumping via hyperfine interaction

Cahaya

2021

Preprint

View full text Add to dashboard Cite

Spin pumping is an interfacial spin current generation from the ferromagnetic layer to the non-magnetic metal at its interface. The polarization of the pumped spin current Js ∝ m × ṁ depends on the dynamics of the magnetic moment m. When the materials are based on light transition metals, mechanism behind the spin current transfer is dominated by the exchange interaction between spin of localized d-electrons and itinerant conduction electrons. In heavier transition metals, however, the interaction is not limited to the exchange interaction. The spin of the conduction electron can interact to its nuclear spin by means of hyperfine interaction, as observed in the shift of NMR frequency. By studying the spin polarization of conduction electron of the non-magnetic metallic layer due to a nuclear magnetic moment I of the ferromagnetic layer, we show that the hyperfine interaction can mediate the spin pumping. The polarization of the spin current generation is shown to have a similar form Js ∝ I × İ.

show abstract

Detecting quadrupole: a hidden source of magnetic anisotropy for Manganese alloys

Cited by 20 publications

References 42 publications

Antiferromagnetic spin pumping via hyperfine interaction

Antiferromagnetic spin pumping via hyperfine interaction

Microstructure, Morphology and Magnetic Property of (001)-Textured MnAlGe Films on Si/SiO<sub>2</sub> Substrate

Antiferromagnetic spin pumping via hyperfine interaction

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