Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Synthesis and characterization of FePt/Au core-shell nanoparticles   In this work, the structural and magnetic properties of the gold-coated FePt
nanoparticles synthesized from high-temperature solution phase are presented.
The amount of gold was optimized to obtain most of the FePt particles coated.
The particle diameter increases from 4 to 10 nm as observed by TEM. The
magnetic properties are largely affected by the coating. At low temperature,
the coercive field Hc of the coated nanoparticles decreases about three times
respect to the uncoated and the blocking temperature reduces to the half. The
changes of the magnetic behavior are discussed in terms of the effect of the
gold atoms at the FePt core surface.

28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci