Spin-Polarized Positron Annihilation Study on Some Ferromagnets
Spin-Polarized Positron Annihilation Study on Some Ferromagnets
复制标题
一些铁磁体的自旋极化正电子湮灭研究
DOI：
10.4028/www.scientific.net/ddf.373.65
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发表时间：
2017
影响因子：
--
通讯作者：
A. Kawasuso
中科院分区：
文献类型：
--
作者：
Hui Li;M. Maekawa;A. Miyashita;A. Kawasuso
我们简要回顾了使用由\(^{68}Ge - ^{68}Ga\)源产生的正电子束对一些铁磁体（铁、钴、镍、钆、\(Co_2MnSi\)、\(Co_2MnAl\)和\(NiMnSb\)）进行的自旋极化正电子湮没实验。多数自旋电子和少数自旋电子之间的微分\(DBAR\)谱通过第一性原理能带结构计算得到了很好的解释。这进一步提供了有关赫斯勒合金半金属性的信息。铁、钴和镍的表面具有更强的负自旋极化，也就是说，多数自旋电子比少数自旋电子更多。为了定量解释所观察到的自旋极化，需要详细的理论计算和进一步的实验。
We briefly review the spin-polarized positron annihilation experiments on some ferromagnets (Fe, Co, Ni, Gd, Co2MnSi, Co2MnAl and NiMnSb) using positron beams generated with 68Ge-68Ga sources. The differential DBAR spectra between majority and minority spin electrons are well interpreted by the first principles band structure calculation. This further provides information about the half-metallicity of the Heusler alloys. The surfaces of Fe, Co and Ni are more negatively spin-polarized, that is, there are more majority than minority spin electrons. To explain the observed spin polarization quantitatively, detailed theoretical calculations and further experiments are required.