Structural and magnetic characterizations of Mn{sub 2}CrO{sub 4} and MnCr{sub 2}O{sub 4} films on MgO(001) and SrTiO{sub 3}(001) substrates by molecular beam epitaxy

Journal Article · Fri Apr 01 00:00:00 EDT 2011 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3545802· OSTI ID:21560139

Jhuang, Yu-Cing; Kuo, K M; Chern, G ^[1]

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1. SPIN Research Center and Physics Department, National Chung Cheng University, Chia-Yi, 621, Taiwan (China)

In this report, we grow MnCr{sub 2}O{sub 4} (124) films, and Mn{sub 2}CrO{sub 4} (214) films, for comparison, on MgO and SrTiO{sub 3} (STO) substrates by oxygen-plasma-assisted molecular beam epitaxy and also carry out the measurements of the magnetization as a function of temperature (5-200 K) and external field (0-5 T) of these films. The results of magnetization versus temperature further show that ferrimagnetic transition (T{sub c}) occurs at 44 K for 214 films grown on both MgO and STO. The T{sub c} of 124 films raises to 45 K but is only observed for the film grown on STO. No or very weak magnetization is observed for the 124 films grown on MgO(001). The vanishing of the magnetization of the 124 films grown on MgO is attributed to the instability of spinel structure for Cr-rich films. Magnetic hysteresis curves of the films further show the magnetization saturation (M{sub s}) of 124 is <1/2 bohr magneton, which is noticeably smaller than the bulk M{sub s} {approx} 1 bohr magneton. The reduction of M{sub s} in these chromites films may result from the cation distribution in that Cr cations distribute in both A and B sites, which is different from the bulk materials. The distribution of Cr cations in both A and B is attributed to the low temperature growth and similar results have been found in previous growth of various ferrite films.

• OSTI ID: 21560139
• Journal Information: Journal of Applied Physics, Vol. 109, Issue 7; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: DOI: 10.1063/1.3545802; (c) 2011 American Institute of Physics; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMITES
CRYSTAL STRUCTURE
DISTRIBUTION
FILMS
INSTABILITY
LAYERS
MAGNESIUM OXIDES
MAGNETIZATION
MANGANESE COMPOUNDS
MOLECULAR BEAM EPITAXY
PLASMA
SATURATION
SPINELS
STRONTIUM TITANATES
SUBSTRATES
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0065-0273 K
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHROMIUM COMPOUNDS
COHERENT SCATTERING
CRYSTAL GROWTH METHODS
DIFFRACTION
EPITAXY
MAGNESIUM COMPOUNDS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SCATTERING
STRONTIUM COMPOUNDS
TEMPERATURE RANGE
THERMODYNAMIC PROPERTIES
TITANATES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS