Spin models for the single molecular magnet Mn12-AC

Al-Saqer, M.

doi:10.31274/rtd-180813-11795

Cited by 1 publication

(1 citation statement)

References 55 publications

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“…Several authors have investigated the spin dynamics theoretically with the emphasis ranging from "minimal" models, assuming as simple a spin Hamiltonian H S and a model of the surroundings as possible (in order to explain experiments, that is), [10][11][12]14,[16][17][18] to more specific models for investigating the role of the dipolar and/or hyperfine interactions, 19,21,22 and combinations of these 12,14,16,23 . The thermally activated relaxation has typically been studied using a master equation approach to describe the time evolution of the spin density matrix.…”

Section: +mentioning

confidence: 99%

Spin dynamics ofMn12-acetate in the thermally activated tunneling regime: ac susceptibility and magnetization relaxation

Pohjola

Schoeller²

2000

Phys. Rev. B

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In this work, we study the spin dynamics of Mn12-acetate molecules in the regime of thermally assisted tunneling. In particular, we describe the system in the presence of a strong transverse magnetic field. Similar to recent experiments, the relaxation time/rate is found to display a series of resonances; their Lorentzian shape is found to stem from the tunneling. The dynamic susceptibility χ(ω) is calculated starting from the microscopic Hamiltonian and the resonant structure manifests itself also in χ(ω). Similar to recent results reported on another molecular magnet, Fe8, we find oscillations of the relaxation rate as a function of the transverse magnetic field when the field is directed along a hard axis of the molecules. This phenomenon is attributed to the interference of the geometrical or Berry phase. We propose susceptibility experiments to be carried out for strong transverse magnetic fields to study of these oscillations and for a better resolution of the sharp satellite peaks in the relaxation rates. 75.45.+j, 75.50.Xx, 75.40.Gb

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