Temperature changes of the Fe${}_8$ molecular magnet during its spin reversal process

Abstract

Tunneling of the spins in the Fe${}_8$ molecular magnet from a metastable ground state to an excited state is accompanied by a decay of these spins to the global ground state, and an increase of the crystal temperature. We measured this temperature using two thermometers, one strongly coupled and the other weakly coupled to the thermal bath. We found that the temperature increases to no greater than $2.2$~K. This upper limit agrees with the flame temperature derived from deflagration theory and previous measurements. In light of this temperature increase we re-examine the Landau, Zener and Stuckelberg (LZS) theory of spin tunneling in large Fe${}_8$ crystals.

arXiv comment4 pages and 4 figures

References in corpus (5)

• Landau Zener method to study quantum phase interference of Fe8 molecular nanomagnets
• Role of dipolar and exchange interactions in the positions and widths of EPR transitions for the single-molecule magnets Fe8 and Mn12
• Theory of magnetic deflagration
• Quantum avalanche in the Fe${}_8$ Molecular-Magnet
• Energy emanating from the molecular nanomagnet Fe${}_8$ revisited

Cited by in corpus (1)

• Magnetization steps in the molecular magnet Ni${}_4$Mo${}_{12}$ revealed by complex exchange bridges