Thermomagnetic irreversibility and magnetic short range ordering in Mn{sub 2.5}Co{sub 0.5}O{sub 4} tetragonal spinel thin films

Journal Article · Sat May 15 04:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3364051· OSTI ID:21476223

Kuo, K M; Chern, G ^[1]; Li, Y Y ^[2]; Wang, C R ^[3]

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1. Department of Physics and Taiwan Spin Research Center, National Chung Cheng University, Chia-Yi, Taiwan 621 (China)
2. Department of Chemical Engineering, National Chung Cheng University, Chia-Yi, Taiwan 621 (China)
3. Department of Physics, National Tunghai University, Taichung, Taiwan 407 (China)

Mn{sub 2.5}Co{sub 0.5}O{sub 4} films are grown on MgO(001) and (011) substrate by molecular beam epitaxy. Detailed structural and magnetic analyses are carried out by x-ray diffraction and magnetization measurements. The reduction of the lattice parameter c/a* ratio and the enhancement of the Curie temperature (from 43 to 66 K), due to the weakening of the Jahn-Teller effect, are observed. In addition, thermomagnetic reversibility is observed at lower temperature and low external filed indicating the existence of local canting states. The randomness of Co cation and uniaxial anisotropy further enhance the local canting effect. An H-T phase diagram is mapped out, which indicates a short rang order state in the temperature 66-85 K separating the ferrimagentic and paramagnetic phases.

• OSTI ID: 21476223
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 107; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
ANISOTROPY
CHALCOGENIDES
COBALT COMPOUNDS
COHERENT SCATTERING
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
CURIE POINT
DIAGRAMS
DIFFRACTION
ELECTRON MICROSCOPY
EPITAXY
FERRIMAGNETIC MATERIALS
FILMS
INFORMATION
JAHN-TELLER EFFECT
LATTICE PARAMETERS
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC MATERIALS
MAGNETISM
MAGNETIZATION
MANGANESE COMPOUNDS
MATERIALS
MICROSCOPY
MINERALS
MOLECULAR BEAM EPITAXY
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PHASE DIAGRAMS
PHYSICAL PROPERTIES
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPINELS
SUBSTRATES
THERMODYNAMIC PROPERTIES
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION