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arXiv 2307.06403cond-mat.mtrl-scicond-mat.mes-hall
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补偿亚铁磁性半金属——Mn$_2$Ru$_x$Ga中的准静态磁化动力学

Quasi-static magnetization dynamics in a compensated ferrimagnetic half-metal -- Mn$_2$Ru$_x$Ga

Ajay Jha, Simon Lenne, Gwenael Atcheson, Karsten Rode, J. M. D. Coey, Plamen Stamenov

AI总结:

本文利用反常霍尔效应、宏观自旋力矩模型及FORC/Preisach模型,精确测定并表征了补偿亚铁磁半金属MRG薄膜的各向异性常数与准静态磁化动力学。

摘要:

在磁矩趋于消失的样品中探索各向异性和多样化磁化动力学,是传统磁测量面临的一项重大挑战,因为现有技术分辨率较低,妨碍了获得准确结果的能力。本研究以四方晶格体系中的补偿亚铁磁性半金属Mn$_2$Ru$_x$Ga(MRG)薄膜为例,通过反常霍尔效应测量,更深入地考察其磁各向异性和准静态磁化动力学。我们的研究提出了一种精确确定这些MRG薄膜全套各向异性常数的创新方法。为此,我们在宏观自旋近似下采用力矩模型对反常霍尔电压曲线进行拟合,从而获得面外各向异性常数$K_1=4.0\ imes10^4$ J m$^{-3}$($K_1/M=0.655$ T)和$K_2=2.54\ imes10^4$ J m$^{-3}$($K_2/M=0.416$ T),以及较弱的面内各向异性常数$K_3=3.48\ imes10^3$ J m$^{-3}$($K_3/M=0.057$ T)。通过额外采用一阶反转曲线(FORC)和经典Preisach磁滞(hysteron)模型,我们验证了宏观自旋模型在描述MRG薄膜磁行为方面的有效性。此外,研究证实,结合磁滞子模型和力矩模型,可以有效模拟MRG薄膜复杂的准静态磁化动力学。该方法有助于在存在外磁场和/或由自旋轨道力矩及自旋转移力矩机制产生的电流诱导有效场时,探索线性和非线性准静态磁化动力学。

英文摘要:

Exploring anisotropy and diverse magnetization dynamics in specimens with vanishing magnetic moments presents a significant challenge using traditional magnetometry, as the low resolution of existing techniques hinders the ability to obtain accurate results. In this study, we delve deeper into the examination of magnetic anisotropy and quasi-static magnetization dynamics in \mrg\,(MRG) thin films, as an example of a compensated ferrimagnetic half-metal, by employing anomalous Hall effect measurements within a tetragonal crystal lattice system. Our research proposes an innovative approach to accurately determine the complete set of anisotropy constants of these MRG thin films. To achieve this, we perform anomalous Hall voltage curve fitting, using torque models under the macrospin approximation, which allow us to obtain out-of-plane anisotropy constants $K_1=4.0\times10^4$ J m$^{-3}$ ($K_1/M=0.655$\,T) and $K_2=2.54\times10^4$ J m$^{-3}$ ($K_2/M=0.416$\,T), along with a weaker in-plane anisotropy constant $K_3=3.48\times10^3$ J m$^{-3}$ ($K_3/M=0.057$\,T). By additionally employing first-order reversal curves (FORC) and classical Preisach hysteresis (hysterons) models, we are able to validate the efficacy of the macrospin model in capturing the magnetic behavior of MRG thin films. Furthermore, our investigation substantiates that the complex quasi-static magnetization dynamics of MRG thin films can be effectively modelled using a combination of hysteronic and torque models. This approach facilitates the exploration of both linear and non-linear quasi-static magnetization dynamics, in the presence of external magnetic field and/or current-induced effective fields, generated by the spin-orbit torque and spin transfer torque mechanisms.

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