Robust formation of skyrmion and skyrmionium in magnetic hemispherical shells and their dynamic switching,Physical Review B

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Robust formation of skyrmion and skyrmionium in magnetic hemispherical shells and their dynamic switching
Physical Review B ( IF 3.2 ) Pub Date : 2021-10-25 , DOI: 10.1103/physrevb.104.134427
Jaehak Yang ₁ , Hyeon-Kyu Park ₁ , Gyuyoung Park ₁ , Claas Abert _{2,

3} , Dieter Suess _{2,

3} , Sang-Koog Kim ₁

Affiliation

We explored the variations of the topological magnetic textures of vortices, skyrmions, and skyrmioniums in magnetic elements of hemispherical-shell shape with respect to surface-normal uniaxial magnetic anisotropy constant

K_{u}

, Dzyaloshinskii-Moriya interaction (DMI) constant

D_{int}

, and shell diameter

2 R

. For given values of

2 R

, the combination of

K_{u}

and

D_{int}

plays a crucial role in the stabilization of those different spin textures. With decreasing

2 R

, the geometrical confinement of hemispherical shells more significantly affects the stabilization of skyrmions owing to curvature-induced DM-like interaction. This effect is contrastingly dependent on the sign of

D_{int}

: skyrmion formation is more favorable for positive

D_{int}

values, whereas it is less favorable for negative ones. A quite promising feature is that skyrmions can be stabilized even in the absence of intrinsic DMI for

2 R < 25 nm

. We also explored characteristic dynamic properties of skyrmions excited by in-plane and out-of-plane oscillating magnetic fields. Similarly to the fundamental dynamic modes found in planar dots, in-plane gyration and azimuthal spin-wave modes as well as out-of-plane breathing modes were found, but additional higher-frequency hybrid modes also appeared due to coupling between radially quantized and azimuthal spin-wave modes. Finally, we found a switching behavior of skyrmion polarity through a transient skyrmionium state using very-low-strength AC magnetic fields. This work provides further physical insight into the static and dynamic properties of skyrmions in curved-geometry nanodots and suggests potential applications to low-power-consumption and ultra-high-density information-storage devices.

中文翻译：

磁性半球壳中skyrmion和skyrmionium的稳健形成及其动态切换

我们探索了半球壳形状的磁性元素中涡旋、斯格明子和斯格明子的拓扑磁结构相对于表面法向单轴磁各向异性常数的变化

钾_{你}

, Dzyaloshinskii-Moriya 相互作用 (DMI) 常数

D_{整数}

, 和壳直径

2 电阻

. 对于给定的值

2 电阻

, 的组合

钾_{你}

和

D_{整数}

在稳定这些不同的自旋纹理方面起着至关重要的作用。随着减少

2 电阻

，由于曲率引起的类 DM 相互作用，半球壳的几何限制对斯格明子的稳定性影响更显着。这种影响相反地取决于

D_{整数}

: 斯格明子形成对阳性更有利

D_{整数}

值，而对负值则不太有利。一个非常有前途的特性是，即使在没有内在 DMI 的情况下，skyrmions 也可以稳定

2 电阻 < 25 纳米

. 我们还探索了由面内和面外振荡磁场激发的斯格明子的特征动态特性。与在平面点中发现的基本动态模式类似，发现了平面内回转和方位角自旋波模式以及平面外呼吸模式，但由于径向量化和方位角自旋波模式。最后，我们通过使用极低强度交流磁场的瞬态skyrmionium 状态发现了skyrmion 极性的切换行为。这项工作为弯曲几何纳米点中斯格明子的静态和动态特性提供了进一步的物理洞察力，并提出了在低功耗和超高密度信息存储设备中的潜在应用。

更新日期：2021-10-26

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