Quantum tunneling of magnetization in single domain particles

J. Tejada; L. Balcells; Søren Linderoth; R. Perzynski; B. Rigau; B. Barbara; J.C. Bacri

doi:10.1063/1.352445

Quantum tunneling of magnetization in single domain particles

J. Tejada
, L. Balcells
, Søren Linderoth
, R. Perzynski
, B. Rigau
, B. Barbara
, J.C. Bacri

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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 domain particles.

Original language	English
Journal	Journal of Applied Physics
Volume	73
Issue number	10
Pages (from-to)	6952-6954
ISSN	0021-8979
DOIs	https://doi.org/10.1063/1.352445
Publication status	Published - 1993

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title = "Quantum tunneling of magnetization in single domain particles",

abstract = "We present a study of the magnetic relaxation of several ferrofluids composed of particles of about 40 {\AA} 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 domain particles.",

keywords = "Materialer til strukturelle form{\aa}l",

author = "J. Tejada and L. Balcells and S{\o}ren Linderoth and R. Perzynski and B. Rigau and B. Barbara and J.C. Bacri",

year = "1993",

doi = "10.1063/1.352445",

language = "English",

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pages = "6952--6954",

journal = "Journal of Applied Physics",

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TY - JOUR

T1 - Quantum tunneling of magnetization in single domain particles

AU - Tejada, J.

AU - Balcells, L.

AU - Linderoth, Søren

AU - Perzynski, R.

AU - Rigau, B.

AU - Barbara, B.

AU - Bacri, J.C.

PY - 1993

Y1 - 1993

N2 - 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 domain particles.

AB - 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 domain particles.

KW - Materialer til strukturelle formål

U2 - 10.1063/1.352445

DO - 10.1063/1.352445

M3 - Journal article

SN - 0021-8979

VL - 73

SP - 6952

EP - 6954

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 10

ER -

Quantum tunneling of magnetization in single domain particles

Abstract

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