Quantum tunneling of magnetization in single domain particles
- Tejada Palacios, Javier
- Balcells i Argemí, Lluís
- Linderoth, S. (Soren)
- Perzynski, R.
- Rigau, B.
- Barbara, B.
- Bacri, J. C. (Jean Claude)
Publication date
January 1993
DOI Publisher
AIP Publishing Journal
Journal of Applied PhysicsAbstract
We present a study of the magnetic relaxation of several ferrofluids composed of particles of about 40 Å in diameter (Fe3O4FeC, CoFe2O4). Our key observation is a nonthermal character of the relaxation below 3 K for the CoFe2O4 ferrofluid and below 1 K for the FeC ferrofluid. The crossover temperature from thermal to nonthermal (quantum) regime is in accordance with theoretical suggestions of macroscopic quantum tunneling of magnetization in single doma in particle
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