INFLUENCE OF SUBSTRATE SURFACE RECONSTRUCTION ON THE GROWTH AND MAGNETIC PROPERTIES OF FE ON GAAS(001)
INFLUENCE OF SUBSTRATE SURFACE RECONSTRUCTION ON THE GROWTH AND MAGNETIC PROPERTIES OF FE ON GAAS(001)
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DOI：
10.1103/physrevb.56.8163
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发表时间：
1997-03
影响因子：
3.7
通讯作者：
E. Kneedler;B. Jonker;P. Thibado;R. Wagner;B. V. Shanabrook;L. Whitman
中科院分区：
文献类型：
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作者：
E. Kneedler;B. Jonker;P. Thibado;R. Wagner;B. V. Shanabrook;L. Whitman
摘要：我们研究了在分子束外延制备的GaAs（001）-2 × 4和-c（4 × 4）重构表面上于175 ℃外延生长的bcc Fe（001）薄膜的磁性和结构特性，薄膜厚度范围达~30 ML（~43）。我们提出的测量的厚度依赖的演变的Fe膜的磁性能所确定的原位磁光克尔效应。我们发现，磁性和生长模式是相似的234和c（434）重建，虽然初始吸附位和岛形核，通过扫描隧道显微镜测量明显占主导地位的衬底表面重建。室温铁磁性的发病发生在6 ML的GaAs表面重建生长。在此覆盖范围内，测得的居里温度（100 ℃）从体α-Fe（770 ℃）显著降低。各向异性主要是由单轴分量，使两个（110）轴是不相等的所有覆盖范围研究。形状各向异性似乎没有发挥重要作用。
Abstract : We have studied the magnetic and structural properties of epitaxial bcc Fe(001) films grown at 175 C on molecular-beam epitaxy-prepared GaAs(001)-2*4 and -c(4*4) reconstructed surfaces, with film thicknesses ranging up to ~30 ML (~43 ). We present measurements of the thickness-dependent evolution of the magnetic properties of the Fe films as determined by in situ magneto-optic Kerr effect. We find that the magnetic properties and growth mode are similar for both 234 and c(434) reconstructions, although the initial adsorption sites and island nucleation as measured by scanning tunneling microscopy are clearly dominated by the substrate surface reconstruction. The onset of room-temperature ferromagnetism occurs at 6 ML for growth on both GaAs surface reconstructions. At this coverage, the measured Curie temperature (100 C) is significantly reduced from that of bulk alpha-Fe (770 C). The anisotropy is dominated by a uniaxial component such that the two (110) axes are inequivalent for all coverages studied. Shape anisotropy does not appear to play a significant role.