The effect of the microstructure on the magnetic interactions in CoFe–AgCu granular films: From demagnetizing to magnetizing interactions
作者:
X. Batlle,
V. Franco,
A. Labarta,
M. L. Watson,
K. O’Grady,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 70,
issue 1
页码: 132-134
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119285
出版商: AIP
数据来源: AIP
摘要:
The sign and strength of the dominant magnetic interactions inCo34Fe8Ag54Cu4granular films were modified by changing the microstructure through annealing. Magnetic force micrographs showed that in the as-cast sample the magnetic moments of neighboring grains tended to be arranged parallel along a direction out of the film plane, forming elongated magnetic clusters that were themselves aligned antiparallel, with dominant demagnetizing interactions. This is a direct evidence that an uncompensated antiferromagneticlike microstructure is stabilized below the volume percolation threshold. However, in the sample annealed at 750 °C the particle growth led to large in-plane ferromagneticlike clusters with dominant magnetizing interactions. Thus, in this letter we present direct correlation of interactions effects with magnetic measurements and show that &Dgr;Mplots correlate with changes in the magnetic microstructure in these systems. ©1997 American Institute of Physics.
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