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The magnetic properties of strained and relaxed Fe3-xMgxO4 ferrite films on MgO(001) and SrTiO3(001) by molecular beam epitaxy.

Authors :
Lee, D. S.
Wang, J. S.
Modak, Dilip K.
Liu, Y. S.
Chang, C. L.
Chern, G.
Source :
Journal of Applied Physics; 5/1/2007, Vol. 101 Issue 9, p09M523, 3p, 4 Graphs
Publication Year :
2007

Abstract

The present study grows a series of Fe<subscript>3-x</subscript>Mg<subscript>x</subscript>O<subscript>4</subscript> (0≤x≤1.5) films and systematically measure both structure and magnetization of these films. These films are grown on MgO and SrTiO<subscript>3</subscript> (STO), which have small (∼-0.3%) and large (∼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<subscript>s</subscript>) of pure Fe<subscript>3</subscript>O<subscript>4</subscript> (x=0) on both substrates is ∼500 emu/cm<superscript>3</superscript>, which is consistent with the bulk value. However, M<subscript>s</subscript> has a fast decrease with increasing x for the films grown on MgO(001), from 340 to ∼100 emu/cm<superscript>3</superscript> in the region of 0.3<x<1.35, and stays at ∼100 emu/cm<superscript>3</superscript> for x>1.35. On the other hand, M<subscript>s</subscript> remains unchanged with x increasing from 0.3 to 1 for the film grown on STO. With x>1, M<subscript>s</subscript> drops abruptly to ∼100 emu/cm<superscript>3</superscript>, which is comparable to M<subscript>s</subscript> of the film grown on MgO. The discrepancy in M<subscript>s</subscript> of Fe<subscript>3-x</subscript>Mg<subscript>x</subscript>O<subscript>4</subscript> 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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218979
Volume :
101
Issue :
9
Database :
Complementary Index
Journal :
Journal of Applied Physics
Publication Type :
Academic Journal
Accession number :
25114761
Full Text :
https://doi.org/10.1063/1.2712826