Thermally-assisted tunnelling of magnetization in (Mn0.96Cr0.04)12-ac

doi:10.1088/1009-1963/13/11/036

Abstract

Abstract The thermally assisted resonant tunnelling in a single crystal (Mn

_{0.96}

Cr

_{0.04}

)12-ac is studied in this paper. The obtained hysteresis loops at seven different temperatures between 1.8 and 3K show obvious dependence on temperature. The magnetization steps occur at specific field values of

n H_{R}

with

H_{R}

≈0.46T, which are approximately independent of the temperature. As the temperature decreases, the area enclosed in the hysteresis loops and the actual number n of the resonances increase, which provides clear evidence of thermally assisted resonant tunnelling in (Mn

_{0.96}

Cr

_{0.04}

)12-ac.

Keywords: quantum tunnelling thermally assisted resonant tunnelling

Received: 09 May 2004
Revised: 03 June 2004
Accepted manuscript online:

PACS:	73.40.Gk	(Tunneling)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	03.65.Xp	(Tunneling, traversal time, quantum Zeno dynamics)

Cite this article:

He Lun-Hua (何伦华), Cao Hui-Bo (曹慧波), Wang Fang-Wei (王芳卫) Thermally-assisted tunnelling of magnetization in (Mn_0.96Cr_0.04)₁₂-ac 2004 Chinese Physics 13 1962

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Thermally-assisted tunnelling of magnetization in (Mn0.96Cr0.04)12-ac

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Thermally-assisted tunnelling of magnetization in (Mn_0.96Cr_0.04)₁₂-ac