INVESTIGADORES
SANCHEZ Rodolfo Daniel
artículos
Título:
Pinning of elastic ferromagnetic/antiferromagnetic interfaces in phase-separated manganites
Autor/es:
D. NIEBIESKIKWIAT; R. D. SANCHEZ
Revista:
JOURNAL OF PHYSICS CONDENSED MATTER
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2012 vol. 24 p. 436001 - 436001
ISSN:
0953-8984
Resumen:
We present a study of the magnetic properties of the Pr 0.5Sr 0.5xCa xMnO 3
manganite (x=0.1 and 0.2) in the temperature region where phase
separation occurs. This state is characterized by the presence of
ferromagnetic (FM) inclusions inside an antiferromagnetic (AFM) matrix.
The evolution of the magnetization (M) with magnetic field shows the
existence of a critical field, H C, above which M rapidly
increases, indicating a sudden expansion of the FM volume against the
AFM one. We analyze this behavior and the response of the magnetic
susceptibility at low fields (H<H C) in terms of a
thermally activated motion of pinned FM/AFM elastic interfaces. The
pinning mechanism is likely to be related to the martensitic
accommodation strain around the magnetic and structural interfaces. From
this analysis we estimate the size of the FM domains and the parameters
that characterize the pinning potential. © 2012 IOP Publishing Ltd.