The magnetic properties of strained and relaxed Fe{sub 3-x}Mg{sub x}O{sub 4} ferrite films on MgO(001) and SrTiO{sub 3}(001) by molecular beam epitaxy
- Physics Department, National Chung Cheng University, Chia-yi, Taiwan 621 (China)
The present study grows a series of Fe{sub 3-x}Mg{sub x}O{sub 4} (0IExIE1.5) films and systematically measure both structure and magnetization of these films. These films are grown on MgO and SrTiO{sub 3} (STO), which have small ({approx}-0.3%) and large ({approx}7.5%) lattice mismatch in order to have either strained or relaxed films, by plasma-oxygen-assisted molecular beam epitaxy, respectively. X-ray diffraction (XRD) is carried out to analyze the crystalline structure. Saturation magnetization (M{sub s}) of pure Fe{sub 3}O{sub 4} (x=0) on both substrates is {approx}500 emu/cm{sup 3}, which is consistent with the bulk value. However, M{sub s} has a fast decrease with increasing x for the films grown on MgO(001), from 340 to {approx}100 emu/cm{sup 3} in the region of 0.3<x<1.35, and stays at {approx}100 emu/cm{sup 3} for x>1.35. On the other hand, M{sub s} remains unchanged with x increasing from 0.3 to 1 for the film grown on STO. With x>1, M{sub s} drops abruptly to {approx}100 emu/cm{sup 3}, which is comparable to M{sub s} of the film grown on MgO. The discrepancy in M{sub s} of Fe{sub 3-x}Mg{sub x}O{sub 4} film grown on MgO and STO may imply that the cation distribution of these films may be fundamentally different. Possible cation distribution and the substrate strain effect will be discussed.
- OSTI ID:
- 20982869
- Journal Information:
- Journal of Applied Physics, Vol. 101, Issue 9; Conference: 10. joint MMM/INTERMAG conference, Baltimore, MD (United States), 7-11 Jan 2007; Other Information: DOI: 10.1063/1.2712826; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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