Application of Mössbauer spectroscopy in magnetism
Application of Mössbauer spectroscopy in magnetism
复制标题
穆斯堡尔谱在磁学中的应用
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
W. Keune
中科院分区：
文献类型：
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作者：
W. Keune
概述了我们最近将57Fe穆斯堡尔谱学应用于纳米磁学中的具体问题的工作。用~(57)Fe转换电子穆斯堡尔谱结合~(57)Fe探针层技术和~(57)Fe核共振散射技术研究了各种纳米尺度的层状体系：(I)亚稳态FCT-Fe；在未镀膜的三层膜上观察到了25℃时∼39℃的强增强超精细磁场；(Ii)用分子束外延技术在邻近的Pd(110)衬底上生长了57Fe(110)超薄膜；这表明存在增强的Fe局域磁矩，如理论预测的μFe；(Ii)Fe自旋结构；通过施加磁场，证实了层状(Sm-Co)/Fe交换弹簧磁体和在交换偏置的Fe/MnF2双层膜中磁化反转过程中的Fe自旋结构是非共线的和深度相关的：(Iii)用于电自旋注入的铁磁/半导体界面；CEMS被用作研究面内或面外Fe自旋取向的GaAs(001)和GaAs(001)基自旋发光二极管(Spin LED)上Fe电接触埋入界面的磁性的诊断工具；在295K下测得的相当大的∼2 7T的平均超精细磁场和超精细磁场P(Bhf)的分布，为在铁磁/半导体界面上不存在磁性“死层”和存在较大的Fe矩(μFe∼1.8μB)提供了证据.最后，对穆斯堡尔光谱学在纳米磁学/自旋电子学等专题中的潜在应用进行了展望。
An overview is provided on our recent work that applies 57Fe Mössbauer spectroscopy to specific problems in nanomagnetism. 57Fe conversion electron Mössbauer spectroscopy (CEMS) in conjunction with the 57Fe probe layer technique as well as 57Fe nuclear resonant scattering (NRS) were employed for the study of various nanoscale layered systems: (i) metastable fct-Fe; a strongly enhanced hyperfine magnetic field Bhf of ∼39 T at 25 K was observed in ultrahigh vacuum (UHV) on uncoated three-monolayers thick epitaxial face-centered tetragonal (fct) 57Fe(110) ultrathin films grown by molecular-beam epitaxy (MBE) on vicinal Pd(110) substrates; this indicates the presence of enhanced Fe local moments, μFe, as predicted theoretically; (ii) Fe spin structure; by applying magnetic fields, the Fe spin structure during magnetization reversal in layered (Sm–Co)/Fe exchange spring magnets and in exchange-biased Fe/MnF2 bilayers was proven to be non-collinear and depth-dependent; (iii) ferromagnet/semiconductor interfaces for electrical spin injection; CEMS was used as a diagnostic tool for the investigation of magnetism at the buried interface of Fe electrical contacts on the clean surface of GaAs(001) and GaAs(001)-based spin light-emitting diodes (spin LED) with in-plane or out-of-plane Fe spin orientation; the measured rather large average hyperfine field of ∼27 T at 295 K and the distribution of hyperfine magnetic fields, P(Bhf), provide evidence for the absence of magnetically “dead” layers and the existence of relatively large Fe moments (μFe ∼ 1.8 μB) at the ferromagnet/semiconductor interface. - Finally, a short outlook is given for potential applications of Mössbauer spectroscopy on topical subjects of nanomagnetism/spintronics.
影响因子：
8.6
作者：
Bernien, M.;Miguel, J.;Wende, H.
通讯作者：
Wende, H.