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Out‐of‐Plane Magnetic Patterning Based on Indentation‐Induced Nanocrystallization of a Metallic Glass
Author(s) -
Sort Jordi,
Bonavina Luiz Fernando,
Varea Aïda,
Souza Carlos,
Botta Walter J.,
Kiminami Claudio S.,
Bolfarini Claudemiro,
Suriñach Santiago,
Baró Maria Dolors,
Nogués Josep
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201000510
Subject(s) - materials science , nanoindentation , amorphous metal , amorphous solid , indentation , ferromagnetism , magnetostriction , coercivity , magnetic anisotropy , condensed matter physics , annealing (glass) , composite material , anisotropy , micrometer , ribbon , magnetization , crystallography , magnetic field , optics , alloy , chemistry , physics , quantum mechanics
Periodic arrays of micrometer‐sized ferromagnetic structures with perpendicular magnetic anisotropy are prepared by nanoindentation at the surface of a Fe 67.7 B 20 Cr 12 Nb 0.3 glassy ribbon initially showing in‐plane magnetic anisotropy. The indented regions exhibit enhanced coercivity and saturation magnetization with respect to the surrounding nondeformed matrix. These effects are due to a mechanically driven selective nanocrystallization of the metallic glass, induced by nanoindentation, even without the need for thermal annealing. In addition, while the amorphous matrix becomes paramagnetic above 325 K, the crystallized regions (consisting of α‐Fe) remain ferromagnetic upon heating to high temperatures. The local change in the magnetic anisotropy direction is ascribed to a certain degree of crystallographic texture, together with the inverse magnetostriction effect caused by the compressive indentation stresses.