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Ferromagnetic phase of the spinel compound MgV_2O_4 and its spintronics properties

机译：尖晶石化合物MgV_2O_4的铁磁相及其熔点性质

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摘要

Spinel compound, MgV_2O_4, known as a highly frustrated magnet has been extensively studied both experimentally and theoretically for its exotic quantum magnetic states. However, due to its intrinsic insulating nature in its antiferromagnetic (AFM) ground state, its realistic applications in spintronics are quite limited. Here, based on first-principles calculations, we examine the ferromagnetic (FM) phase of MgV_2O_4, which was found to host three-dimensional flat band (FB) right near the Fermi level, consequently yielding a large anomalous Hall effect (AHE, σ ≈ 670 Ω~(-1) cm~(-1)). Our calculations suggest that the half-metallicity feature of MgV_2O_4 is preserved even after interfacing with MgO due to the excellent lattice matching, which could be a promising spin filtering material for spintronics applications. Lastly, we explore experimental feasibility of stabilizing this FM phase through strain and doping engineering. Our study suggests that an experimentally accessible amount of hole doping might induce a AFM-FM phase transition.
机译：尖晶石化合物MGV_2O_4，已知为高度沮丧的磁体，已经在实验和理论上广泛地研究了其异乎寻常的量子磁力状态。然而，由于其在其反铁磁（AFM）地位的内在绝缘性，其在闪光灯中的现实应用非常有限。这里，基于第一原理计算，我们检查MgV_2O_4的铁磁性（FM）相，发现该术呈现在FERMI水平附近的三维平带（FB），因此产生了大的异常霍尔效应（AHE，σ ≈670Ω〜（-1）cm〜（-1））。我们的计算表明，由于具有优异的栅格匹配，即使在与MgO接口之后，也保留了MGV_2O_4的半金属性特征，这可能是用于闪铜器应用的有希望的自旋过滤材料。最后，我们探讨通过应变和掺杂工程稳定该FM相的实验性。我们的研究表明，实验可访问量的孔掺杂量可能会引起AFM-FM相转变。

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  • 来源
    《Physical review》 |2020年第15期|155144.1-155144.6|共6页
  • 作者

    Javad G. Azadani; Wei Jiang; Jian-Ping Wang; Tony Low;

  • 作者单位

    Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA;

    Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA;

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