Butterfly hysteresis and slow relaxation of the magnetization in (Et4N)3Fe2F9: Manifestations of a single-molecule magnet

Ralph Schenker; Michael N. Leuenberger; Grégory Chaboussant; Hans U. Güdel; Daniel Loss

doi:10.1016/S0009-2614(02)00670-X

Butterfly hysteresis and slow relaxation of the magnetization in (Et₄N)₃Fe₂F₉: Manifestations of a single-molecule magnet

Ralph Schenker
, Michael N. Leuenberger
, Grégory Chaboussant
, Hans U. Güdel^*
, Daniel Loss

^*Corresponding author for this work

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

13 Scopus citations

Abstract

(Et₄N)₃Fe₂F₉ exhibits a butterfly-shaped hysteresis below 5 K when the magnetic field is parallel to the threefold axis, in accordance with a very slow magnetization relaxation in the timescale of minutes. This is attributed to an energy barrier Δ = 2.40 K resulting from the S = 5 dimer ground state of [Fe₂F₉]^3- and a negative axial anisotropy. The relaxation partly occurs via thermally assisted quantum tunneling. These features of a single-molecule magnet are observable at temperatures comparable to the barrier height, due to an extremely inefficient energy exchange between the spin system and the phonons. The butterfly shape of the hysteresis arises from a phonon avalanche effect.

Original language	English
Pages (from-to)	413-418
Number of pages	6
Journal	Chemical Physics Letters
Volume	358
Issue number	5-6
DOIs	https://doi.org/10.1016/S0009-2614(02)00670-X
State	Published - 7 Jun 2002
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

Access to Document

10.1016/S0009-2614(02)00670-X

Cite this

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title = "Butterfly hysteresis and slow relaxation of the magnetization in (Et4N)3Fe2F9: Manifestations of a single-molecule magnet",

abstract = "(Et4N)3Fe2F9 exhibits a butterfly-shaped hysteresis below 5 K when the magnetic field is parallel to the threefold axis, in accordance with a very slow magnetization relaxation in the timescale of minutes. This is attributed to an energy barrier Δ = 2.40 K resulting from the S = 5 dimer ground state of [Fe2F9]3- and a negative axial anisotropy. The relaxation partly occurs via thermally assisted quantum tunneling. These features of a single-molecule magnet are observable at temperatures comparable to the barrier height, due to an extremely inefficient energy exchange between the spin system and the phonons. The butterfly shape of the hysteresis arises from a phonon avalanche effect.",

author = "Ralph Schenker and Leuenberger, \{Michael N.\} and Gr{\'e}gory Chaboussant and G{\"u}del, \{Hans U.\} and Daniel Loss",

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T1 - Butterfly hysteresis and slow relaxation of the magnetization in (Et4N)3Fe2F9

T2 - Manifestations of a single-molecule magnet

AU - Schenker, Ralph

AU - Leuenberger, Michael N.

AU - Chaboussant, Grégory

AU - Güdel, Hans U.

AU - Loss, Daniel

PY - 2002/6/7

Y1 - 2002/6/7

N2 - (Et4N)3Fe2F9 exhibits a butterfly-shaped hysteresis below 5 K when the magnetic field is parallel to the threefold axis, in accordance with a very slow magnetization relaxation in the timescale of minutes. This is attributed to an energy barrier Δ = 2.40 K resulting from the S = 5 dimer ground state of [Fe2F9]3- and a negative axial anisotropy. The relaxation partly occurs via thermally assisted quantum tunneling. These features of a single-molecule magnet are observable at temperatures comparable to the barrier height, due to an extremely inefficient energy exchange between the spin system and the phonons. The butterfly shape of the hysteresis arises from a phonon avalanche effect.

AB - (Et4N)3Fe2F9 exhibits a butterfly-shaped hysteresis below 5 K when the magnetic field is parallel to the threefold axis, in accordance with a very slow magnetization relaxation in the timescale of minutes. This is attributed to an energy barrier Δ = 2.40 K resulting from the S = 5 dimer ground state of [Fe2F9]3- and a negative axial anisotropy. The relaxation partly occurs via thermally assisted quantum tunneling. These features of a single-molecule magnet are observable at temperatures comparable to the barrier height, due to an extremely inefficient energy exchange between the spin system and the phonons. The butterfly shape of the hysteresis arises from a phonon avalanche effect.

UR - https://www.scopus.com/pages/publications/0037036303

U2 - 10.1016/S0009-2614(02)00670-X

DO - 10.1016/S0009-2614(02)00670-X

M3 - Article

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SN - 0009-2614

VL - 358

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EP - 418

JO - Chemical Physics Letters

JF - Chemical Physics Letters

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