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首页> 外文期刊>Physical review.B.Condensed matter and materials physics >Nonlocal spin Seebeck effect in the bulk easy-plane antiferromagnet NiO
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Nonlocal spin Seebeck effect in the bulk easy-plane antiferromagnet NiO

机译:非局部旋转塞贝克效应在散装容易平面反霉菌NIO中

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摘要

We report the observation of magnon spin currents generated by the spin Seebeck effect (SSE) in a bulk single crystal of the easy-plane antiferromagnet NiO. A magnetic field induces a nondegeneracy and thereby an imbalance in the population of magnon modes with opposite spins. A temperature gradient then gives rise to a nonzero magnon spin current. This SSE is measured in both a local and a nonlocal geometry at 5 K in bulk NiO. The magnetic field dependence of the obtained signal is modeled by magnetic field splitting of the low-energy magnon modes, affecting the spin Seebeck coefficient. The relevant magnon modes at this temperature are linked to cubic anisotropy and magnetic dipole-dipole interactions. The nonlocal signal deviates from the expected quadratic Joule heating by saturating at a current from around 75 μA in the injector. The magnon chemical potential does not decay exponentially with distance and inhomogeneities may be the result of local magnon accumulations.
机译:我们报告了在易于平面反霉菌NIO的散装单晶中产生的旋转塞贝克效应(SSE)产生的菱镁旋转电流。磁场诱导不平衡,从而在具有相反旋转的Magnon模式中的不平衡。然后温度梯度产生非零菱镁旋转电流。该SSE在局部NIO中的局部和非局部几何形状中测量。所获得的信号的磁场依赖性由低能量氧元模式的磁场分离建模,影响旋扎焦系数。该温度的相关Magnon模式与立方体各向异性和磁性偶极子相互作用有关。非局部信号通过在喷射器中的约75μA的电流下饱和来偏离预期的二次焦耳加热。 MAGNON化学电位与距离呈指数衰减,并且不均匀性可能是局部肿块累积的结果。

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  • 来源
    《Physical review.B.Condensed matter and materials physics》 |2020年第21期|214415.1-214415.6|共6页
  • 作者单位

    Physics of Nanodevices Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands;

    Physics of Nanodevices Zernike Institute for Advanced Materials University of Groningen Nijenborgh 4 9747 AG Groningen The Netherlands;

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