In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 40, No. 11R ( 2001-11-01), p. 6370-
Abstract:
Nanogranular thin films consisting of Ni 1- x Co x alloy nanoparticles separated by graphitic matrices are fabricated by a co-sputtering method. The structure and magnetic properties of the films are studied. An improvement in their magnetic properties by optimizing the alloy ratio will be demonstrated. Transmission electron microscopic (TEM) observation shows nanoparticles with a small mean diameter (∼ 7 nm) and narrow size distribution (∼ 20% of mean diameter) at the Co/(Ni+Co) ratio ( x ) ranging from 0 to 0.83. In this region, the coercivity continuously increases with x and manifests a maximum value of 907 Oe at x =0.83. The increase can be explained in terms of alloy formation. With further increasing x up to x =1, the coercivity decreases. The decrease is caused by the existence of extremely large Co particles, which are revealed by TEM observation.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.40.6370
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2001
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
