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Spin relaxation between the two lowest-lying spin-states has been studied in the S = 4 single molecule magnet Ni4 under steady state conditions of low amplitude and continuous microwave irradiation.â€¦ (More)

- Dmitry A. Garanin, Richard S. F. Schilling, Alessandro Scala
- Physical review. E, Statistical, nonlinear, andâ€¦
- 2004

We investigate the potential energy surface of a phi(4) model with infinite range interactions. All stationary points can be uniquely characterized by three real numbers alpha(+) , alpha(0) ,â€¦ (More)

â€“ We consider the inverse Landau-Zener problem which consists in finding the energy-sweep functions W (t) â‰¡ Îµ1(t) âˆ’ Îµ2(t) resulting in the required time dependences of the level populations for aâ€¦ (More)

- Thomas C Proctor, Dmitry A. Garanin, Eugene M. Chudnovsky
- Physical review letters
- 2014

We consider an n-component fixed-length order parameter interacting with a weak random field in d=1, 2, 3 dimensions. Relaxation from the initially ordered state and spin-spin correlation functionsâ€¦ (More)

- Eugene M. Chudnovsky, Dmitry A. Garanin
- Physical review letters
- 2002

We show that crystals of molecular nanomagnets can exhibit giant magnetic relaxation due to the Dicke superradiance of electromagnetic waves. Rigorous theory is presented that combines superradianceâ€¦ (More)

Effective giant spins of magnetic nanoparticles are considered classically in the conventional theory of superparamagnetism based on the Landau-Lifshitz-Langevin equation. However , microscopicâ€¦ (More)

We derive a free energy for weakly anisotropic ferromagnets which is valid in the whole range of temperature and interpolates between the micromagnetic energy at zero temperature and the Landau freeâ€¦ (More)

- Dmitry A. Garanin, Hamid Kachkachi
- Physical review letters
- 2003

We calculate the contribution of the NÃ©el surface anisotropy to the effective anisotropy of magnetic nanoparticles of spherical shape cut out of a simple cubic lattice. The effective anisotropyâ€¦ (More)

â€“ A method is proposed for obtaining a systematic expansion of thermodynamic functions of spin systems with large spin S in powers of 1/S. It uses the cumulant technique and a coherent-stateâ€¦ (More)

â€“ We compute the width and shape of the EPR and tunneling resonances due to dislocations in Mn-12 acetate crystals. Uncorrelated dislocations produce the Gaussian shape of resonances whileâ€¦ (More)