Abstract We investigate the effects of strain and film thickness on the coercivity of La0.67Ca0.33MnO3 films grown on SrTiO3 and LaAlO3 substrates. Textured microstructure with the grain [001] pseudo-cubic axis normal to the film surface is obtained. The average grain size decreases with decreasing film thickness t. The magnetic anisotropy depends upon the substrate-induced strain. Firstly, the intrinsic coercivity iHC increases as t varies from 5 nm to 10 nm, then attains a maximum at t～10—25nm. A further increase in t yields a gradual reduction of iHC. By the analysis of the dependence of iHC on the measured direction of magnetic field, the coercivity mechanism is assumed to be mainly determined by the nucleation of reversed domain and the domain wall pining for t≤10nm and t≥25nm, respectively, which were further verified by the investigation of the initial magnetization curves for the LCMO/STO films with t=5, 10, 25 and 400nm, and the minor magnetic loops for the LCMO/LAO films with t=5 and 50nm. Moreover, the size of the inhomogeneous region in which the nucleation or pinning takes place is discussed.
Received: 31 August 2004
Revised: 16 November 2004
Accepted manuscript online:
PACS:
75.70.Ak
(Magnetic properties of monolayers and thin films)
Fund: Project supported by the Funds of Outstanding Young Researchers from the National Science Foundation of China (Grant No 50225209) and the State Key Project from the National Natural Science Foundation of China (Grant No 19934010).
Cite this article:
Xiong Chang-Min (熊昌民), Sun Ji-Rong (孙继荣), Wang Deng-Jing (王登京), Liu Guan-Juan (刘光娟), Zhang Hong-Wei (张宏伟), Shen Bao-Gen (沈保根) Dependence of the coercivity of La0.67Ca0.33MnO3 films on substrate and thickness 2005 Chinese Physics 14 604
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