Phase decomposition and related structural and magnetic properties of iron-cobaltite thin films

被引：12
作者：
Kim, Kwang Joo [1 ]
Lee, Jung Han [1 ]
Kim, Chul Sung [2 ]
机构：
[1] Konkuk Univ, Dept Phys, Seoul 143701, South Korea
[2] Kookmin Univ, Dept Phys, Seoul 136702, South Korea
来源：
JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2012年 / 61卷 / 08期
关键词：
Spinodal decomposition; Iron-cobaltite; Spinel; Thin film; Magnetization; Ionic valence; TRANSITION-METAL OXIDE; ELECTRONIC-STRUCTURE; ION BATTERIES; SPINEL; MAGNETORESISTANCE; COO(100);
D O I：
10.3938/jkps.61.1274
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Iron-cobaltite (Co3-x Fe (x) O-4) thin films exhibited a spinodal decomposition (SD) into two distinct cubic spinel phases as the Fe composition was varied near x = 1. Polycrystalline films of spinel oxides (x a parts per thousand currency sign 2.0) were prepared on Si(100) substrates by using a sol-gel deposition, followed by subsequent air-annealing at 800 A degrees C. X-ray diffraction results revealed that the two coexisting spinel phases (I and II) in the SD region had different lattice constants by about 2% (a (I) < a (II)). Phases I and II were found to have Fe compositions of about 0.5 and 1.5, respectively. The X-ray photoelectron spectroscopy investigation indicated that the Fe ions mainly had a valence of +3 for all Fe compositions. Magnetic hysteresis measurements revealed that phase II had a magnetization strength larger than that of phase I by about 20 times. These experimental results imply specific site preference of Co2+ ions for the two phases of the SD region: tetrahedral sites for phase I and octahedral sites for phase II.
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页码：1274 / 1278
页数：5
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