Ferromagnetic ordering in Mn induced by thermal strain

Title
Ferromagnetic ordering in Mn induced by thermal strain
Authors
황영훈최정용홍순철조성래한석희신경호정명화
Keywords
antiferromagnetic materials; Curie temperature; ferromagnetic materials; high-temperature effects; magnetic moment; magnetic thin films; manganese; metallic thin films; Neel temperature; paramagnetic materials
Issue Date
2009-01
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 79, NO 4, 045309-1-045309-5
Abstract
We report that the thermal strain due to the thermal-expansion difference between a Mn film and a semiconductor substrate is strong enough to overcome the thermal energy for a paramagnetic PM state and also to break antiferromagnetic AF magnetic symmetry, inducing ferromagnetic FM ordering at high temperatures. AMn film on GaAs 100 showed FM ordering up to 9000 Å with a Curie temperature TC of over 750 K and a net magnetic moment of 0.33 B/Mn, instead of AF Néel temperature, TN=95 K and PM orderings in bulk.
URI
http://pubs.kist.re.kr/handle/201004/35220
ISSN
1098-0121
Appears in Collections:
KIST Publication > Article
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