Thermally assisted resonant quantum tunneling of magnetization in Fe8 clusters

X. X. Zhang; J. M. Hernandez; E. Del Barco; J. Tejada; A. Roig; E. Molins; K. Wieghardt

doi:10.1063/1.369823

Thermally assisted resonant quantum tunneling of magnetization in Fe₈ clusters

X. X. Zhang^*, J. M. Hernandez, E. Del Barco, J. Tejada, A. Roig, E. Molins, K. Wieghardt

^*Corresponding author for this work

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

13 Scopus citations

Abstract

Magnetic ac susceptibility of randomly arranged crystallites (powder sample) and well-oriented Fe₈ crystallites has been measured as a function of applied magnetic field, temperature, and frequency. The Fe₈ clusters, made of eight iron ions and with formula [(tacn)₆Fe₈O₂(OH)₁₂]⁸⁺, have a ground state S=10. From the magnetization data M(H) with the dc field, H, applied parallel and perpendicular to the easy axis of the aligned sample and χ″(T) data for different frequencies, the anisotropy field H_an∼5 T and energy barrier U/k_B=26.9K were obtained. Peaks in the curves of χ′(H) were clearly observed at fields H_n=nH₀, with n=0,±1 for powder sample where H₀ = 2.4 kOe; and n=0, ±1, ±2, for an oriented sample where H₀=2.2 kOe. These peaks appearing at H_n=nH₀ in the curves of χ′(H) can be well described by the thermally assisted resonant quantum tunneling of magnetization.

Original language	English (US)
Pages (from-to)	5633-5635
Number of pages	3
Journal	Journal of Applied Physics
Volume	85
Issue number	8 II B
DOIs	https://doi.org/10.1063/1.369823
State	Published - Apr 15 1999
Externally published	Yes
Event	Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials - Miami, FL, United States Duration: Nov 9 1998 → Nov 12 1998

ASJC Scopus subject areas

General Physics and Astronomy

Access to Document

10.1063/1.369823

Cite this

@article{900a8b0abc924b599252c867e3eb9860,

title = "Thermally assisted resonant quantum tunneling of magnetization in Fe8 clusters",

abstract = "Magnetic ac susceptibility of randomly arranged crystallites (powder sample) and well-oriented Fe8 crystallites has been measured as a function of applied magnetic field, temperature, and frequency. The Fe8 clusters, made of eight iron ions and with formula [(tacn)6Fe8O2(OH)12]8+, have a ground state S=10. From the magnetization data M(H) with the dc field, H, applied parallel and perpendicular to the easy axis of the aligned sample and χ″(T) data for different frequencies, the anisotropy field Han∼5 T and energy barrier U/kB=26.9K were obtained. Peaks in the curves of χ′(H) were clearly observed at fields Hn=nH0, with n=0,±1 for powder sample where H0 = 2.4 kOe; and n=0, ±1, ±2, for an oriented sample where H0=2.2 kOe. These peaks appearing at Hn=nH0 in the curves of χ′(H) can be well described by the thermally assisted resonant quantum tunneling of magnetization.",

author = "Zhang, {X. X.} and Hernandez, {J. M.} and {Del Barco}, E. and J. Tejada and A. Roig and E. Molins and K. Wieghardt",

year = "1999",

month = apr,

day = "15",

doi = "10.1063/1.369823",

language = "English (US)",

volume = "85",

pages = "5633--5635",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "AIP Publishing",

number = "8 II B",

note = "Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials ; Conference date: 09-11-1998 Through 12-11-1998",

}

TY - JOUR

T1 - Thermally assisted resonant quantum tunneling of magnetization in Fe8 clusters

AU - Zhang, X. X.

AU - Hernandez, J. M.

AU - Del Barco, E.

AU - Tejada, J.

AU - Roig, A.

AU - Molins, E.

AU - Wieghardt, K.

PY - 1999/4/15

Y1 - 1999/4/15

N2 - Magnetic ac susceptibility of randomly arranged crystallites (powder sample) and well-oriented Fe8 crystallites has been measured as a function of applied magnetic field, temperature, and frequency. The Fe8 clusters, made of eight iron ions and with formula [(tacn)6Fe8O2(OH)12]8+, have a ground state S=10. From the magnetization data M(H) with the dc field, H, applied parallel and perpendicular to the easy axis of the aligned sample and χ″(T) data for different frequencies, the anisotropy field Han∼5 T and energy barrier U/kB=26.9K were obtained. Peaks in the curves of χ′(H) were clearly observed at fields Hn=nH0, with n=0,±1 for powder sample where H0 = 2.4 kOe; and n=0, ±1, ±2, for an oriented sample where H0=2.2 kOe. These peaks appearing at Hn=nH0 in the curves of χ′(H) can be well described by the thermally assisted resonant quantum tunneling of magnetization.

AB - Magnetic ac susceptibility of randomly arranged crystallites (powder sample) and well-oriented Fe8 crystallites has been measured as a function of applied magnetic field, temperature, and frequency. The Fe8 clusters, made of eight iron ions and with formula [(tacn)6Fe8O2(OH)12]8+, have a ground state S=10. From the magnetization data M(H) with the dc field, H, applied parallel and perpendicular to the easy axis of the aligned sample and χ″(T) data for different frequencies, the anisotropy field Han∼5 T and energy barrier U/kB=26.9K were obtained. Peaks in the curves of χ′(H) were clearly observed at fields Hn=nH0, with n=0,±1 for powder sample where H0 = 2.4 kOe; and n=0, ±1, ±2, for an oriented sample where H0=2.2 kOe. These peaks appearing at Hn=nH0 in the curves of χ′(H) can be well described by the thermally assisted resonant quantum tunneling of magnetization.

UR - http://www.scopus.com/inward/record.url?scp=0000106261&partnerID=8YFLogxK

U2 - 10.1063/1.369823

DO - 10.1063/1.369823

M3 - Conference article

AN - SCOPUS:0000106261

SN - 0021-8979

VL - 85

SP - 5633

EP - 5635

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 8 II B

T2 - Proceedings of the 43rd Annual Conference on Magnetism and Magnetic Materials

Y2 - 9 November 1998 through 12 November 1998

ER -

Thermally assisted resonant quantum tunneling of magnetization in Fe₈ clusters

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this