MAGNETIC PROPERTIES OF NANOCRYSTALLINE CO-FERRITE FILMS DEPOSITED ON SINGLE-CRYSTALSiO2SUBSTRATES USING PULSED LASER DEPOSITION

J. H. Yin, J. Ding (), B. H. Liu, X. S. Miao, J. B. Yi and J. S. Chen
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J. H. Yin: Department of Material Sciences and Engineering, National University of Singapore, Singapore 119620, Singapore;
J. Ding: Department of Material Sciences and Engineering, National University of Singapore, Singapore 119620, Singapore
B. H. Liu: Department of Material Sciences and Engineering, National University of Singapore, Singapore 119620, Singapore
X. S. Miao: Data Storage Institute, 5 Engineering Drive 1, Singapore 117608, Singapore
J. B. Yi: Department of Material Sciences and Engineering, National University of Singapore, Singapore 119620, Singapore
J. S. Chen: Department of Material Sciences and Engineering, National University of Singapore, Singapore 119620, Singapore;

Surface Review and Letters (SRL), 2008, vol. 15, issue 01n02, 71-75

Abstract: Co-ferrite films were prepared using pulsed laser deposition with both post-annealing andin situheating processes. Magnetic properties of these films were studied in the function of temperature, film thickness, and substrate. The films using post-annealing processes exhibited isotropic microstructure, and the coercivity showed no obvious magnetic anisotropy and no strong dependence on film thickness. Co-ferrite films usingin situheating exhibited (111) highly textured structure and possessed perpendicular anisotropy as well as large coercivity. The preferential texture and magnetic anisotropy were closely associated with substrate temperature and thickness. Perpendicular Hc over 12.5 kOe was obtained in the 33 nm Co-ferrite film deposited on single crystal quartz substrate at 550°C. The high coercivity and perpendicular coercivity may be attributed to the nanocrystalline grain, textured orientation, and large residual strain in these films since large residual strain may induce strong stress anisotropy.

Keywords: Co-ferrite; high coercivity; pulsed laser deposition (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08010981

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