Co-Fe替代对Co_3-xFe_xSi Heusler化合物薄膜室温自旋极化的影响
Effect of Co-Fe substitutions on the room-temperature spin polarization in Co_3-xFe_xSi Heusler-compound films
摘要：
本文用低温分子束外延技术研究了在Si和Ge衬底上生长的Co_3-xFe_xSi Heusler化合物薄膜中Fe原子对Co原子的替代。即使对于低温生长的Heusler化合物薄膜，也可以通过转换电子穆斯堡尔谱的测量来证实A和C位的Co-Fe原子替代。结果表明，由非局域自旋阀测量估计的磁矩和室温自旋极化随Co-Fe取代发生了系统的变化。实验证实了Co_3-xFe_xSi Heusler化合物中Co-Fe替代对室温自旋极化的影响。
英文摘要：
Using low-temperature molecular beam epitaxy, we study substitutions of Fe atoms for Co ones in Co_3-xFe_xSi Heusler-compound films grown on Si and Ge. Even for the low-temperature grown Heusler-compound films, the Co-Fe atomic substitution at A and C sites can be confirmed by the conversion electron M"ossbauer spectroscopy measurements. As a result, the magnetic moment and room-temperature spin polarization estimated by nonlocal spin-valve measurements are systematically changed with the Co-Fe substitutions. This study experimentally verified that the Co-Fe substitution in Co_3-xFe_xSi Heusler compounds can directly affect the room-temperature spin polarization.
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