Two‐dimensional magnetic phase transition of ultrathin iron films on Pd(100)
Two‐dimensional magnetic phase transition of ultrathin iron films on Pd(100)
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DOI：
10.1063/1.345954
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发表时间：
1990-05
影响因子：
3.2
通讯作者：
C. Liu;S. Bader
中科院分区：
文献类型：
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作者：
C. Liu;S. Bader
在Pd（100）上生长的外延Fe薄膜被用来研究单层磁性，临界行为和表面磁各向异性，通过原位表面磁光克尔效应测量。在10−11 Torr真空中的辅助LEED-Auger观测用于表征（1×1）外延和逐层薄膜生长模式。对于0.6-4单层（ML）的所有Fe厚度，检测到铁磁磁滞回线，TC随厚度单调增加，与易轴取向无关。对于100-K薄膜生长，易磁化轴垂直于低于2.5 ML临界厚度的薄膜平面，并且对于在300 K下生长的薄膜的所有厚度，易磁化轴在该厚度以上在平面内重新取向。磁化强度的温度依赖性是从在Reynolds状态下的克尔环的高度获得的，并用于提取不同的膜厚度和自旋取向的有效磁化指数β。对于1.2-ML Fe膜，报告了β=0.127±0.004的值。
Epitaxial Fe films grown on Pd(100) are used to study monolayer magnetism, critical behavior, and surface magnetic anisotropy, by means of in situ surface magneto‐optical Kerr‐effect measurements. Auxiliary LEED‐Auger observations in 10−11 Torr vacuum are used to characterize the (1×1) epitaxy and the layer‐by‐layer film‐growth mode. Ferromagnetic hysteresis loops were detected for all Fe thicknesses from 0.6–4 monolayers (ML) with the TC monotonically increasing with thickness, independent of the easy‐axis orientation. The easy axis is perpendicular to the film plane below a critical thickness of 2.5 ML for 100‐K film growth, and reorients in‐plane above this thickness, and for all thicknesses for films grown at 300 K. The temperature dependence of the magnetization was obtained from the height of the Kerr loops in the remanent state and used to extract an effective magnetization exponent β for different film thicknesses and spin orientations. A value of β=0.127±0.004 is reported for a 1.2‐ML Fe film wit...