Peddis_Fe@Cr_accepted.pdf (1.3 MB)
Magnetic anisotropy and superspin glass behaviour of Fe nanoparticles embedded in Cr and Ag matrices
journal contribution
posted on 2015-10-21, 10:04 authored by D. Peddis, M. T. Qureshi, Stephen H. Baker, Chris Binns, Mervyn Roy, S. Laureti, D. Fiorani, P. Nordblad, R. MathieuStatic and dynamical magnetic
properties of
Fe
nanoparticles
(NPs)
embedded
in non
-
magnetic
(Ag) and antiferromagnetic (Cr) matrices
with a volume filling fraction
(VFF)
of 10%
have been
investigated
. In both
Fe@Ag and Fe@Cr nanocomposites
, the Fe nanoparticles have a narrow size
distribution, with
a
mean particle diameter
around
2 nm. In both
samples
, the saturation
magnetization reaches that of
Fe
bulk bcc, suggesting
the absence
of
alloying
with the matrices.
The
coercivity
at 5 K
is
much larger in Fe@Cr
than in Fe@Ag
as a result of
the
strong interaction
between
the
Fe NPs and
the
Cr matrix. Temperature
-
dependent magnetization and ac
-
susceptibility
measurements
point out
further
evidence
of
the
enhanced
inter
-
particle interaction in
the
Fe@Cr
system
. While
the
behavior
of Fe@Ag
indicates the presence of weakly interacting magnetic
monodomain particles
with a wide distribution of
blocking temperatures
, Fe@Cr
behaves like a
superspin glass
produced
by the
magnetic
interaction
between
nanoparticles.
History
Citation
Philosophical Magazine, 2015, doi: 10.1080/14786435.2015.1090640Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and AstronomyVersion
- AM (Accepted Manuscript)