Quantum tunneling in magnetic systems of various sizes (invited)

B. Barbara; L. C. Sampaio; J. E. Wegrowe; B. A. Ratnam; A. Marchand; C. Paulsen; M. A. Novak; J. L. Tholence; M. Uehara; D. Fruchart

doi:10.1063/1.352508

Quantum tunneling in magnetic systems of various sizes (invited)

B. Barbara
, L. C. Sampaio
, J. E. Wegrowe
, B. A. Ratnam
, A. Marchand
, C. Paulsen
, M. A. Novak
, J. L. Tholence
, M. Uehara
, D. Fruchart

Institut NÉEL
National Institute for Materials Science

Research output: Contribution to journal › Article › peer-review

80 Citations (Scopus)

Abstract

Magnetic relaxation experiments constitute a unique method of determining the nature of fluctuations in dissipative magnetic systems. At high temperatures these fluctuations are thermal and strongly temperature dependent. At low temperatures, where quantum fluctuations dominate, magnetic relaxation becomes independent of temperature. Such behavior has been observed in many systems. In this review we emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including "domain wall junctions"), and large single crystals. The results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization. When dissipation becomes important, in large and complex systems, a time dependent WKB exponent needs to be introduced.

Original language	English
Pages (from-to)	6703-6708
Number of pages	6
Journal	Journal of Applied Physics
Volume	73
Issue number	10
DOIs	https://doi.org/10.1063/1.352508
Publication status	Published - 1 Dec 1993
Externally published	Yes

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title = "Quantum tunneling in magnetic systems of various sizes (invited)",

abstract = "Magnetic relaxation experiments constitute a unique method of determining the nature of fluctuations in dissipative magnetic systems. At high temperatures these fluctuations are thermal and strongly temperature dependent. At low temperatures, where quantum fluctuations dominate, magnetic relaxation becomes independent of temperature. Such behavior has been observed in many systems. In this review we emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including {"}domain wall junctions{"}), and large single crystals. The results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization. When dissipation becomes important, in large and complex systems, a time dependent WKB exponent needs to be introduced.",

author = "B. Barbara and Sampaio, \{L. C.\} and Wegrowe, \{J. E.\} and Ratnam, \{B. A.\} and A. Marchand and C. Paulsen and Novak, \{M. A.\} and Tholence, \{J. L.\} and M. Uehara and D. Fruchart",

year = "1993",

month = dec,

day = "1",

doi = "10.1063/1.352508",

language = "English",

volume = "73",

pages = "6703--6708",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Quantum tunneling in magnetic systems of various sizes (invited)

AU - Barbara, B.

AU - Sampaio, L. C.

AU - Wegrowe, J. E.

AU - Ratnam, B. A.

AU - Marchand, A.

AU - Paulsen, C.

AU - Novak, M. A.

AU - Tholence, J. L.

AU - Uehara, M.

AU - Fruchart, D.

PY - 1993/12/1

Y1 - 1993/12/1

N2 - Magnetic relaxation experiments constitute a unique method of determining the nature of fluctuations in dissipative magnetic systems. At high temperatures these fluctuations are thermal and strongly temperature dependent. At low temperatures, where quantum fluctuations dominate, magnetic relaxation becomes independent of temperature. Such behavior has been observed in many systems. In this review we emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including "domain wall junctions"), and large single crystals. The results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization. When dissipation becomes important, in large and complex systems, a time dependent WKB exponent needs to be introduced.

AB - Magnetic relaxation experiments constitute a unique method of determining the nature of fluctuations in dissipative magnetic systems. At high temperatures these fluctuations are thermal and strongly temperature dependent. At low temperatures, where quantum fluctuations dominate, magnetic relaxation becomes independent of temperature. Such behavior has been observed in many systems. In this review we emphasize the study of low temperature relaxation in ferromagnetic nanoparticles, layers, and multilayers (including "domain wall junctions"), and large single crystals. The results of magnetic relaxation experiments are shown to agree with theoretical predictions of quantum tunneling of the magnetization. When dissipation becomes important, in large and complex systems, a time dependent WKB exponent needs to be introduced.

U2 - 10.1063/1.352508

DO - 10.1063/1.352508

M3 - Article

AN - SCOPUS:0001663071

SN - 0021-8979

VL - 73

SP - 6703

EP - 6708

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 10

ER -

Quantum tunneling in magnetic systems of various sizes (invited)

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