Quantifying the Dzyaloshinskii-Moriya Interaction Induced by the Bulk Magnetic Asymmetry

Zhang, Qihan; Liang, Jinghua; Bi, Kaiqi; Le, Zhao; Bai, Hanying; Cui, Qirui; Zhou, Huaichun; Bai, Haitao; Feng, Hongmei; Song, Wenlei; Chai, Guozhi; Gladii, Olga; Schultheiß, Helmut; Zhu, Tao; Zhang, Junwei; Peng, Yong; Yang, Hongxin; Jiang, Wanjun

doi:10.1103/physrevlett.128.167202

Cited by 39 publications

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References 52 publications

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“…For given x ̅, ⟨ε DM ⟩ depends almost linearly with k showing a minor change for different n z (see Figure (b)), which indicates that the total DMI has a nearly linear correlation with both the composition gradient and film thickness. Such notable features have been identified in the GdFeCo , and CoPt thin films. As discussed below, these are resulted from the additive nature of g-DMI inside the bulk of films.…”

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confidence: 65%

“…Recently, the Dzyaloshinskii–Moriya interaction (DMI) has gained much attention since it is recognized to play an essential role in a broad range of physical phenomena, such as the observation of magnetic skyrmions, − fast current-controlled domain wall motion, , magnetoelectric effect, , topological Hall effect, and magnetization switching. , The emergence of DMI requires the breaking of inversion symmetry in the spin system with spin–orbit coupling (SOC). , In magnetic multilayers, it is usually believed that the disorders like the intermixing and dusting of elements at interfaces are detrimental to the interfacial DMI. , Interestingly, recent experiments − have observed a significant DMI (termed g-DMI hereafter) in the amorphous thin films with a composition gradient to break the inversion symmetry. The measured DMI value shows a linear relation with the film thickness, signifying a bulk nature of g-DMI despite in the thin films.…”

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confidence: 99%

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Gradient-Induced Dzyaloshinskii–Moriya Interaction

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The Dzyaloshinskii−Moriya interaction (DMI) that arises in the magnetic systems with broken inversion symmetry plays an essential role in topological spintronics. Here, by means of atomistic spin calculations, we study an intriguing type of DMI (g-DMI) that emerges in the films with composition gradient. We show that both the strength and chirality of g-DMI can be controlled by the composition gradient even in the disordered system. The layerresolved analysis of g-DMI unveils its additive nature inside the bulk layers and clarifies the linear thickness dependence of g-DMI observed in experiments. Furthermore, we demonstrate the g-DMI-induced chiral magnetic structures, such as spin spirals and skyrmions, and the g-DMI driven field-free spin−orbit torque (SOT) switching, both of which are crucial toward practical device application. These results elucidate the underlying mechanisms of g-DMI and open up a new way to engineer the topological magnetic textures.

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Gradient-Induced Dzyaloshinskii–Moriya Interaction

et al. 2022

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“…This range covers the skyrmion stability region shown in Figure . The DMI gradient can be also introduced by creating composition gradients or strains induced at interfaces due to specific deposition approaches. , …”

Section: Resultsmentioning

confidence: 99%

“…The DMI gradient can be also introduced by creating composition gradients or strains induced at interfaces due to specific deposition approaches. 40,41 To characterize the DMI-gradient-driven motion, we compare it to the motion induced by a spin-polarized current. We place the skyrmion at the center of the stripe, with dimensions of 700 × 200 × 1 nm.…”

Section: Analytical Consideration Of Skyrmion Motion Based On the Thi...mentioning

confidence: 99%

DMI-Gradient-Driven Skyrmion Motion

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et al. 2022

ACS Appl. Electron. Mater.

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We study skyrmion control in an artificial ultrathin magnetic film with perpendicular anisotropy. We simulate numerically the skyrmion motion induced by spatial gradient of the Dzyaloshinskii–Moriya interaction (DMI) strength. We show that creating the DMI gradient is an efficient way to move skyrmions. In particular, experimentally achievable DMI gradients can be as effective as spin-polarized electric currents with 1011 A/m2 density. At that, the DMI gradient induces a much weaker skyrmion Hall effect. The DMI gradient can be created with a mechanical strain in a ferroelectric–ferromagnetic hybrid system. This opens an alternative way to manipulate skyrmions.

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“…The room-temperature magnetic structure of hematite (α-Fe 2 O 3 ), so-called phase II [3,4], meets the three material requirements for a PND investigation. The Greek philosopher Theophrastus is said to mention ichorlike hematite at around 315 B.C., with later work by the father of magnetism, William Gilbert of Colchester, in the 16th century.…”

Section: Introductionmentioning

confidence: 99%