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Magnetization reversal in Gd0.67Ca0.33MnO3: Comparison between epitaxial thin films and bulk
- Source :
-
Applied Surface Science . Oct2007, Vol. 254 Issue 1, p339-342. 4p. - Publication Year :
- 2007
-
Abstract
- Abstract: Rare-earth-based manganites ABO3 may present interesting properties when the lanthanide (A-site) and/or the manganese (B-site) are partially substituted by divalent elements. Heavy lanthanides are particularly appealing because of the expected interplay between the intrinsic magnetic properties of the rare-earth element (Ln) and those of the ferromagnetic manganese sublattice. As such, a spin reorientation has been observed during magnetization-versus-temperature cycles due to a negative exchange interaction between Mn and Ln. We present herein high-quality epitaxial thin films (∼200nm thick) of Gd0.67Ca0.33MnO3 deposited onto (100) SrTiO3 substrates by pulsed-laser deposition. Enhanced properties were observed in comparison with bulk samples. The magnetic transition temperature T c of the as-grown films is much higher than the corresponding bulk values. Most interesting, magnetization measurements performed under small applied fields, exhibit magnetization reversals below T c, no matter whether the film is field-cooled (FC) or zero-field-cooled (ZFC). The reversal mechanism is discussed in terms of a negative exchange f–d interaction and magnetic anisotropy, this latter enhanced by strain effects induced by the lattice mismatch between the film and the substrate. [Copyright &y& Elsevier]
- Subjects :
- *THIN films
*SURFACES (Technology)
*SOLID state electronics
*THICK films
Subjects
Details
- Language :
- English
- ISSN :
- 01694332
- Volume :
- 254
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Applied Surface Science
- Publication Type :
- Academic Journal
- Accession number :
- 27049623
- Full Text :
- https://doi.org/10.1016/j.apsusc.2007.07.061