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arXiv 2104.09614cond-mat.mes-hallcond-mat.mtrl-scicond-mat.otherphysics.app-ph
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悬浮Cr $_2$ Ge $_2$ Te $_6$异质结构居里温度的纳米机械探测和应变调谐

Nanomechanical probing and strain tuning of the Curie temperature in suspended Cr$_2$Ge$_2$Te$_6$ heterostructures

Makars Šiškins, Samer Kurdi, Martin Lee, Benjamin J. M. Slotboom, Wenyu Xing, Samuel Mañas-Valero, Eugenio Coronado, Shuang Jia, Wei Han, Toeno van der Sar, Her… 展开作者

Makars Šiškins, Samer Kurdi, Martin Lee, Benjamin J. M. Slotboom, Wenyu Xing, Samuel Mañas-Valero, Eugenio Coronado, Shuang Jia, Wei Han, Toeno van der Sar, Herre S. J. van der Zant, Peter G. Steeneken

摘要:

具有强磁致伸缩的二维(2D)磁性材料是用于应变调谐磁化的有趣系统,使得实现自旋电子器件和纳米磁性器件成为可能。实现这一潜力需要了解的磁-机械耦合在2D的限制。在这项工作中,我们暂停薄Cr $_2$ Ge $_2$ Te $_6$层,创建纳米机械膜谐振器。我们探测它的机械和磁性作为温度和应变的函数。磁弹性耦合的显著签名中观察到这些膜附近的$T_{\rm C}$的温度依赖性的共振频率。我们进一步利用具有正热膨胀系数的WSe $_2$和FePS $_3$薄层的异质结构中的Cr $_2$ Ge $_2$ Te $_6$来补偿Cr $_2$ Ge $_2$ Te $_6$的负热膨胀系数,并定量探测相应的$T_{\rm C}$。最后,我们通过静电力在悬浮异质结构中诱导$0.016\%$的应变,并证明在没有外部磁场的情况下由$2.5 \pm 0.6$ K产生的$T_{\rm C}$的增强。

英文摘要:

Two-dimensional (2D) magnetic materials with strong magnetostriction are interesting systems for strain-tuning the magnetization, enabling potential for realizing spintronic and nanomagnetic devices. Realizing this potential requires understanding of the magneto-mechanical coupling in the 2D limit. In this work, we suspend thin Cr$_2$Ge$_2$Te$_6$ layers, creating nanomechanical membrane resonators. We probe its mechanical and magnetic properties as a function of temperature and strain. Pronounced signatures of magneto-elastic coupling are observed in the temperature-dependent resonance frequency of these membranes near $T_{\rm C}$. We further utilize Cr$_2$Ge$_2$Te$_6$ in heterostructures with thin layers of WSe$_2$ and FePS$_3$, which have positive thermal expansion coefficients, to compensate the negative thermal expansion coefficient of Cr$_2$Ge$_2$Te$_6$ and quantitatively probe the corresponding $T_{\rm C}$. Finally, we induce a strain of $0.016\%$ in a suspended heterostructure via electrostatic force and demonstrate a resulting enhancement of $T_{\rm C}$ by $2.5 \pm 0.6$ K in the absence of an external magnetic field.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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