Investigation on the structure and magnetic properties at low temperature for nanocrystalline γ′-Fe4N thin films

被引：0
作者：
Wang, L.L. [1 ]
Zheng, W.T. [2 ]
Gong, J. [1 ]
Li, H.B. [3 ]
Wang, X. [2 ]
Ma, N. [2 ]
Cao, P.J. [4 ]
Ma, X.C. [4 ]
机构：
[1] College of Science, Changchun University, Changchun, 130022, China
[2] Department of Materials Science, Key Laboratory of Automobile Materials, MOE, Changchun, 130012, China
[3] Physical College, Jilin Normal University, Siping, 136000, China
[4] Key Laboratory of Special Functional Materials of Shenzhen City, Shenzhen, 518060, China
来源：
Journal of Alloys and Compounds | 2009年 / 467卷 / 1-2期
关键词：
Nanocrystalline γ′-Fe4N thin films were synthesized on single crystal Si (1 0 0) substrate by facing target magnetron sputtering at a mixture of Ar/N2 gas discharge; and their structure; morphology; and magnetic properties at room temperature and low temperature were characterized using X-ray diffraction (XRD); scanning electron microscopy (SEM); and vibrating sample magnetometer (VSM); respectively. The results showed that the films were γ′-Fe4N with an average grain size of 55 nm; which had a highly preferred orientation along (1 1 1). The ratio of remanent magnetization Mr over saturated magnetization Ms at room temperature for γ′-Fe4N was 0.528; which indicated that the films had a single easy magnetized direction. In the temperature range of 80-350 K; the saturation magnetization Ms and coercive force Hc increased; whereas the ratio of Mr/Ms decreased with decreasing temperature. The relation between the coercive force Hc and temperature T observed a T1/2 law; and the coercivity at T = 0 K of 356.87 Oe and blocking temperature of 667 K were acquired; respectively; However; the relation between Ms and T did not observe the Bloch T3/2 law; which meant that the interaction among spin waves should be considered. Through fitting Ms-T equation; the saturation magnetization at T = 0 K of 202 emu/g; Bloch constant of 1.0 × 10-4 K-3/2; and exchange interaction constant of 1.537 × 10-21 were obtained; respectively. © 2007 Elsevier B.V. All rights reserved;
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