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首页> 外文会议>Acta physica polonica A >Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_(0.71)Ni_(0.29) Alloy
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Anisotropy of the Neutron Scattering in the Paramagnetic Phase and on the Spin Waves in the Mn_(0.71)Ni_(0.29) Alloy

机译：Mn_（0.71）Ni_（0.29）合金在顺磁相和自旋波中的中子散射各向异性

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摘要

We have confirmed the significant anisotropy of the generalised magnetic susceptibility in the paramagnetic and antiferromagnetic phase of the fcc Mn-Ni alloys. In this paper the detailed account of the experiments performed on the Mn_(0.71)Ni_(0.29) alloy is given. Our main result for the paramagnetic phase is that the correlation length is larger for the direction parallel to the anisotropy axis than for the perpendicular one by a factor of 1.6. The spin-wave velocity observed at 15 K is higher for the direction parallel to the anisotropy axis than that for the perpendicular direction by a factor of 1.2. These results are similar to that for the Mn_(0.62)Ni_(0.38) alloy. Our results indicate that the magnetic carriers are more localized and the magnetic interactions are less extended in alloys with higher Ni concentration.
机译：我们已经确认了fcc Mn-Ni合金的顺磁和反铁磁相中广义磁化率的显着各向异性。本文详细介绍了对Mn_（0.71）Ni_（0.29）合金进行的实验。我们对顺磁相的主要结果是，与各向异性轴平行的方向的相关长度比垂直方向的相关长度大1.6倍。平行于各向异性轴的方向在15 K下观察到的自旋波速度比垂直方向的自旋波速度高1.2倍。这些结果类似于Mn_（0.62）Ni_（0.38）合金的结果。我们的结果表明，在具有较高Ni浓度的合金中，磁性载体更局限，且磁性相互作用的扩展较少。

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