Original scientific paper

Thermal relaxation and quantum tunnelling of the magnetization in Mn12-acetate

Damir Pajić ; Department of Physics, Faculty of Science, University of Zagreb, Bijeni cka c. 32, HR-10000 Zagreb, Croatia
Krešo Zadro ; Department of Physics, Faculty of Science, University of Zagreb, Bijeni cka c. 32, HR-10000 Zagreb, Croatia
Tomislav Friščić ; Department of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia
Nenad Judaš ; Department of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia
Ernest Meštrović ; Department of Chemistry, Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Ul. kralja Zvonimira 8, HR-10000 Zagreb, Croatia

Abstract

The dependence of the magnetic moment m on the temperature T and the magnetic field H in a synthesized molecular magnet Mn12-acetate has been measured using a SQUID magnetometer. The splitting of zero-field cooled (ZFC) and field-cooled (FC) m(T) curves below the so-called blocking temperature TB (≈ 3.6 K at H = 0) was observed. By measuring the time relaxation of m, it was found that it tended to the same value with the same relaxation time (≈ 560 s at 3 K) for both ZFC and FC processes. This indicates spin freezing below TB and the single molecule process in the explored temperature range (2 K

Keywords

Mn12-acetate; quantum tunnelling; magnetic relaxation; magnetic bistability; blocking temperature; anisotropy barrier; spin freezing

Hrčak ID:

301017

URI

https://hrcak.srce.hr/301017

Publication date:

3.10.1999.

Article data in other languages: croatian

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