QUANTUM TUNNELING OF MAGNETIZATION IN SINGLE-DOMAIN PARTICLES

Authors
TEJADA J BALCELLS LI LINDEROTH S PERZYNSKI R RIGAU B BARBARA B BACRI JC
Citation
J. Tejada et al., QUANTUM TUNNELING OF MAGNETIZATION IN SINGLE-DOMAIN PARTICLES, Journal of applied physics, 73(10), 1993, pp. 6952-6954
Citations number
13
Categorie Soggetti
Physics, Applied
Journal title
Journal of applied physics → ACNP
ISSN journal
00218979
Volume
73
Issue
10
Year of publication
1993
Part
2B
Pages
6952 - 6954
Database
ISI
SICI code
0021-8979(1993)73:10<6952:QTOMIS>2.0.ZU;2-J
Abstract
We present a study of the magnetic relaxation of several ferrofluids c omposed of particles of about 40 angstrom in diameter (Fe3O4FeC, CoFe2 O4). Our key observation is a nonthermal character of the relaxation b elow 3 K for the CoFe2O4 ferrofluid and below 1 K for the FeC ferroflu id. The crossover temperature from thermal to nonthermal (quantum) reg ime is in accordance with theoretical suggestions of macroscopic quant um tunneling of magnetization in single domain particles.