| | |
Summary: phys. stat. sol. (b) 243, No. 3, 732737 (2006) / DOI 10.1002/pssb.200541239
© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Fabrication and magnetoelectronic properties
of field aligned CrO2 powders
D. Tripathy and A. O. Adeyeye*
Information Storage Materials Laboratory, Department of Electrical and Computer Engineering,
4 Engineering Drive 3, National University of Singapore, 117576 Singapore
Received 19 January 2005, revised 21 November 2005, accepted 22 November 2005
Published online 10 January 2006
PACS 72.20.Ee, 72.20.My, 73.40.Gk, 75.60.Ej
We have combined field alignment technique together with lithography to fabricate CrO2 powder based
devices. A systematic study of the temperature-dependent magnetoelectronic properties has been carried
out. The devices exhibit strong anisotropy along the alignment direction at all temperatures. Temperature
dependent analysis of the hysteresis loops shows that coercivity of the field aligned powders increases
with decreasing temperature. The conduction mechanism has been examined in detail and a transition
from tunneling across grain boundaries to inelastic hopping was observed at 215 K. This transition tem-
perature shifts to 230 K in the presence of 10 kOe field cooling due to reduction of the spin-independent
hopping conductance channel.
© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
1 Introduction
|
