Bulk Dzyaloshinskii–Moriya interaction in amorphous ferrimagnetic alloys

Kim, Duck Ho; Haruta, Mitsutaka; Ko, Hye Won; Go, Gyungchoon; Park, Hyeon Jong; Nishimura, Toshiro; Kim, Dae Yun; Okuno, T.; Hirata, Yoshihiro; Futakawa, Yasuhiro; Yoshikawa, Hideki; Ham, Wooseung; Kim, Sang-Hoon; Kurata, Hiroki; Tsukamoto, Arata; Shiota, Yoichi; Moriyama, Takahiro; Choe, Sug–Bong; Lee, Kyung Jin; Ono, Teruo

doi:10.1038/s41563-019-0380-x

Cited by 132 publications

(109 citation statements)

References 32 publications

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“…The effective DMI constant can be estimated to be D eff = Et = 0.18 mJ m −2 , with t the thickness of the Dy-Co layer of 70 nm. The value of 0.18 mJ m −2 follows the value for (Gd,Fe),Co when extrapolated to 70 nm [48]. This value is one order of magnitude smaller than for the prototypical Pt/Co interface (on the order of millijoules per square meter) [49], in which Néel domain walls or skyrmions are stabilized [50,51].…”

Section: Origin Of the Chiral Domain Wallmentioning

confidence: 54%

“…3(a) results for the bulk DMI energy density between Dy and Co moments. The remaining question is whether the DMI is inherently present in the whole Dy-Co layer [48] or exists only in the Dy-Co atomic layers next to the interface [19] triggered by the adjacent Ni-Fe layer. Very recently, a bulk DMI in (Gd,Fe),Co amorphous ferrimagnets has been reported, and was attributed to an asymmetric distribution of the elemental content [48].…”

Section: Origin Of the Chiral Domain Wallmentioning

confidence: 99%

“…The remaining question is whether the DMI is inherently present in the whole Dy-Co layer [48] or exists only in the Dy-Co atomic layers next to the interface [19] triggered by the adjacent Ni-Fe layer. Very recently, a bulk DMI in (Gd,Fe),Co amorphous ferrimagnets has been reported, and was attributed to an asymmetric distribution of the elemental content [48]. Even though no evidence can be provided here for such an asymmetric distribution of Dy and Co, the finding of an asymmetric magnetization from the surface to the bulk in a thin film of DyCo 4 [18] suggests the existence of a bulklike DMI in the Dy-Co system.…”

Section: Origin Of the Chiral Domain Wallmentioning

confidence: 99%

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Observation of a Chirality-Induced Exchange-Bias Effect

et al. 2019

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Chiral magnetism that manifests in the existence of skyrmions or chiral domain walls offers an alternative way for creating anisotropies in magnetic materials that might have large potential for application in future spintronic devices. Here we show experimental evidence for an alternative type of in-plane exchange-bias effect present at room temperature that is created from a chiral 90 • domain wall at the interface of a ferrimagnetic-ferromagnetic Dy-Co/Ni-Fe bilayer system. The chiral interfacial domain wall forms due to the exchange coupling of Ni-Fe and Dy-Co at the interface and the presence of Dzyaloshinskii-Moriya interaction in the Dy-Co layer. As a consequence of the preferred chirality of the interfacial domain wall, the sign of the exchange-bias effect can be reversed by changing the perpendicular orientation of the Dy-Co magnetization. The chirality-created tunable exchange bias in Dy-Co/Ni-Fe is very robust against high in-plane magnetic fields (μ 0 H ≤ 6 T) and does not show any aging effects. Therefore, it overcomes the limitations of conventional exchange-bias systems.

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Section: Origin Of the Chiral Domain Wallmentioning

confidence: 54%

Section: Origin Of the Chiral Domain Wallmentioning

confidence: 99%

Section: Origin Of the Chiral Domain Wallmentioning

confidence: 99%

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Observation of a Chirality-Induced Exchange-Bias Effect

et al. 2019

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“…Recently it was shown that Neél DMI can be obtained in the Janus monolayers of chromium trihalides Cr(I,X) 3 [42]. It is also important to note that DMI was recently observed in amorphous GdFeCo films [43].…”

Section: Modelmentioning

confidence: 95%

Spontaneous deformation of flexible ferromagnetic ribbons induced by Dzyaloshinskii-Moriya interaction

et al. 2019

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Here, we predict the effect of the spontaneous deformation of a flexible ferromagnetic ribbon induced by Dzyaloshinskii-Moriya interaction (DMI). The geometrical form of the deformation is determined both by the type of DMI and by the equilibrium magnetization of the stripe. We found three different geometrical phases, namely (i) the DNA-like deformation with the stripe central line in the form of a helix, (ii) the helicoid deformation with the straight central line and (iii) cylindrical deformation. In the main approximation the magnitude of the DMI-induced deformation is determined by the ratio of the DMI constant and the Young's modulus. It can be effectively controlled by the external magnetic field, what can be utilized for the nanorobotics applications. All analytical calculations are confirmed by numerical simulations.

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“…[36,37] 이러한 DM 상호작용은 안정된 자성 스커미언 구조를 형성하는데 중요한 역할을 한다. [23] 교토대학교(김덕호 박사, 테루오 오노 교수) 연구팀은 비정질 준강자성체에서 원소 조성 의 연속적인 변화가 공간 반전 대칭성의 깨짐을 유도하여 DM 상호작용이 발현할 수 있음을 보고하였다 [38] 이 자화의 스핀 방향으로 향하고, 그 반작용으로 자성체의 스 핀이 돌아가는 현상을 나타낸다. 자세한 내용이 궁금한 독자분 들은 이현우 교수님이 작성하신 기사를 읽어보길 권한다.…”

Section: Magnetic Skyrmion In Ferrimagnetic Materialsunclassified

Bulk Dzyaloshinskii–Moriya interaction in amorphous ferrimagnetic alloys

Cited by 132 publications

References 32 publications

Observation of a Chirality-Induced Exchange-Bias Effect

Observation of a Chirality-Induced Exchange-Bias Effect

Spontaneous deformation of flexible ferromagnetic ribbons induced by Dzyaloshinskii-Moriya interaction

Rediscovery of Uselessness: Dynamics of the Magnetic Skyrmion in Ferrimagnetic Materials

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