INVESTIGADORES
SIRENA Martin
artículos
Título:
Influence of ion implantation on the magnetic and transport properties of manganite films
Autor/es:
M. SIRENA; A. ZIMMERS; N. HABERKORN; E. KAUL; L. B. STEREN; J. LESUEUR; T. WOLF; Y. LE GALL; J.-J. GROB; G. FAINI
Revista:
PHYSICAL REVIEW B
Editorial:
AMER PHYSICAL SOC
Referencias:
Año: 2010 p. 134439 - 134445
ISSN:
1098-0121
Resumen:
We have used oxygen ions
irradiation to generate controlled structural disorder in thin manganite films.
Conductive atomic force microscopy CAFM), transport and magnetic measurements
were performed to analyze the influence of the implantation process in the
physical properties of the films. CAFM images show regions with different
conductivity values, probably due to the random distribution of point defect.
The transport and magnetic properties of these systems are interpreted in this
context. Metal-insulator transition can be described in the frame of a
percolative model. Disorder increases the distance between conducting regions,
lowering the observed TMI. Point defect disorder increases
localization of the carriers due to increased disorder and locally enhanced
strain field. Remarkably, even with the inhomogeneous nature of the samples, no
sign of low field magnetoresistance was found. Point defect disorder decreases
the system magnetization but doesnt seem to change the magnetic transition
temperature. The coercive field of the samples increases linearly with
increasing disorder but decreases when disorder is higher than a critical
value.