Tanaka N, Nagao M, Yoshizaki F, Mihama K
Department of Applied Physics, Faculty of Engineering, Nagoya University, Japan.
J Electron Microsc Tech. 1989 Jul;12(3):272-80. doi: 10.1002/jemt.1060120310.
Single crystalline composite films of iron and MgO are prepared by a simultaneous vacuum deposition technique. The structures of the composite films, especially of the iron crystallites embedded, are studied by high-resolution electron microscopy and nanometer-area electron diffraction. The alpha-iron (b.c.c.) crystallites of 1 nm in size are epitaxially embedded in single crystalline MgO films, the orientation being (011)[100]Fe parallel (001)[100]MgO and (001)[110]Fe parallel (001)[100]MgO. A heat treatment of the as-grown films at 500-1,000 degrees C brings about a phase transformation of the crystallites from alpha-iron to gamma-iron (f.c.c.), followed by a grain growth of alpha-iron and finally the growth of the spinel, MgFe2O4. The gamma-iron crystallites transformed are circular plates and have strains at the periphery to accommodate the surrounding MgO-matrix. The magnetic property of the composite films is also reported.
通过同步真空沉积技术制备了铁和氧化镁的单晶复合薄膜。利用高分辨率电子显微镜和纳米区域电子衍射研究了复合薄膜的结构，特别是嵌入其中的铁微晶的结构。尺寸为1纳米的α-铁（体心立方）微晶外延嵌入单晶氧化镁薄膜中，取向为(011)[100]Fe平行于(001)[100]MgO以及(001)[110]Fe平行于(001)[100]MgO。对生长态薄膜在500 - 1000℃进行热处理，会使微晶发生从α-铁到γ-铁（面心立方）的相变，随后α-铁晶粒长大，最终尖晶石MgFe2O4生长。转变后的γ-铁微晶为圆形薄片，其周边存在应变以适应周围的氧化镁基体。还报道了复合薄膜的磁性。
