Spin-dependent Band Structure, Fermi Surface, and Carrier Lifetime of Permalloy
Spin-dependent Band Structure, Fermi Surface, and Carrier Lifetime of Permalloy
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DOI：
10.1063/1.122796
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发表时间：
1998-12
影响因子：
4
通讯作者：
D. Petrovykh;K. N. Altmann;H. Höchst;M. Laubscher;S. Maat;G. Mankey;F. Himpsel
中科院分区：
文献类型：
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作者：
D. Petrovykh;K. N. Altmann;H. Höchst;M. Laubscher;S. Maat;G. Mankey;F. Himpsel
用角分辨光电子能谱测定了坡莫合金(Ni0.8Fe0.2)的能带，并与Ni、Co、Cu进行了比较。能量和动量分辨率(≈0.01eV和≈0.01A−1)足够高，足以分辨费米水平上的磁性分裂带，这些分裂带负责自旋相关的电导和隧道效应。Σ-1带的磁交换分裂δEex=0.27 eV(Ni为0.23 eV)，δkex=0.16±0.02A−1(Ni为0.12±0.01A−1)，费米速度VF↑=(0.22±0.02)106m/S(Ni为0.28×106m/S，面心立方钴为0.33×106m/S)，宽度δk↑⩽0.11A−1和δk↓=0.24A−1。坡莫合金的特点是费米表面的磁分裂增加了27%，少数自旋的平均自由程极短，为4-8A。
Angle-resolved photoemission is used to determine the energy bands of permalloy (Ni0.8Fe0.2) and compare them to Ni, Co, and Cu. The energy and momentum resolution (≈0.01 eV and ≈0.01 A−1) is high enough to resolve the magnetically split bands at the Fermi level that are responsible for spin-dependent conductivity and tunneling. For the Σ1 band we find the magnetic exchange splittings δEex=0.27 eV (0.23 eV for Ni), δkex=0.16±0.02 A−1 (0.12±0.01 A−1 for Ni), the Fermi velocity vF↑=(0.22±0.02)106 m/s (0.28×106 m/s for Ni, 0.33×106 m/s for fcc Co), and the widths δk↑⩽0.11 A−1 and δk↓=0.24 A−1. Compared to Ni, permalloy features a 27% larger magnetic splitting of the Fermi surface and an extremely short mean free path of 4–8 A for minority spins.