| Issue |
Europhys. Lett.
Volume 35, Number 4, August I 1996
|
|
|---|---|---|
| Page(s) | 301 - 306 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00570-7 | |
| Published online | 01 September 2002 | |
Field tuning of thermally activated magnetic quantum tunnelling in Mn12-Ac molecules
1
Facultat de Física, Universitat de Barcelona - 08028 Barcelona, Spain
2
Instituto de Ciencia de Materiales de Aragón - 50009 Zaragoza, Spain
3
Wilson Center for Research and Technology, Xerox Corporation, Webster NY
14580, USA
Received:
13
March
1996
Accepted:
17
June
1996
Zero-field–cooled magnetization, magnetic relaxation, and a.c. susceptibility measurements
have been performed on a 
-Ac oriented powdered sample as a function of
temperature, field, and orientation. Magnetization jumps and susceptibility peaks have
been observed about magnetic-field values 
, where 
5 kG. These
anomalies are due to the existence of relaxation rate maxima near Bn.
From these experimental results we infer the existence of resonant spin
tunnelling between degenerate excited levels of opposite spin
orientation.
PACS: 75.30.Cr – Saturation moments and magnetic susceptibilities / 75.50.Tt – Fine-particle systems / 75.30.Gw – Magnetic anisotropy
© EDP Sciences, 1996
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