Premium
Fabrication and magnetoelectronic properties of field aligned CrO 2 powders
Author(s) -
Tripathy D.,
Adeyeye A. O.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200541239
Subject(s) - materials science , condensed matter physics , coercivity , hysteresis , fabrication , anisotropy , conductance , field (mathematics) , grain boundary , thermal conduction , quantum tunnelling , nanotechnology , optoelectronics , composite material , microstructure , optics , physics , medicine , alternative medicine , mathematics , pathology , pure mathematics
We have combined field alignment technique together with lithography to fabricate CrO 2 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 temperature 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)