Spin reversal in Fe8 under fast pulsed magnetic fields

We report measurements on magnetization reversal in the Fe8 molecular magnet using fast pulsed magnetic fields of 1.5 kT s−1 and in the temperature range of 0.6-4.1 K. We observe and analyze the temperature dependence of the reversal process, which involves in some cases several resonances. Our expe...

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Bibliographic Details
Published inNew journal of physics Vol. 17; no. 7; pp. 073006 - 73012
Main Authors Jammalamadaka, S Narayana, Vélez, S, Vanacken, J, Moshchalkov, V V, Chibotaru, L F, Tejada, J, Macià, F
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.07.2015
Subjects
Deflagration
Emergence
low dimension magnetism
Magnetic fields
Magnetization reversal
mangetic deflagration
Physics
Quantum tunnelling
spin dynamics
Temperature dependence
Thermal instability
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Summary:We report measurements on magnetization reversal in the Fe8 molecular magnet using fast pulsed magnetic fields of 1.5 kT s−1 and in the temperature range of 0.6-4.1 K. We observe and analyze the temperature dependence of the reversal process, which involves in some cases several resonances. Our experiments allow observation of resonant quantum tunneling of magnetization up to a temperature of ∼4 K. We also observe shifts in the maxima of the relaxation within each resonance field with temperature that suggest the emergence of a thermal instability-a combination of spin reversal and self-heating that may result in a magnetic deflagration process. The results are mainly understood in the framework of thermally-activated quantum tunneling transitions in combination with emergence of a thermal instability.
ISSN:1367-2630
DOI:10.1088/1367-2630/17/7/073006