Thermally activated transitions in a system of two single domain ferromagnetic particles | Zendy

Dorin Cimpoesu | Zendy; Alexandru Stancu | Zendy; I. Klik | Zendy; ChingRay Chang | Zendy; Leonard Spînu | Zendy

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Thermally activated transitions in a system of two single domain ferromagnetic particles

Author(s) -

Dorin Cimpoesu,

Alexandru Stancu,

I. Klik,

ChingRay Chang,

Leonard Spînu

Publication year - 2011

Publication title -

journal of applied physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.699

H-Index - 319

eISSN - 1089-7550

pISSN - 0021-8979

DOI - 10.1063/1.3562884

Subject(s) - metastability , condensed matter physics , ferromagnetism , hysteresis , antiferromagnetism , coupling (piping) , physics , langevin equation , single domain , dipole , materials science , magnetic domain , domain (mathematical analysis) , function (biology) , statistical physics , magnetization , magnetic field , quantum mechanics , mathematics , metallurgy , mathematical analysis , evolutionary biology , biology

Numerical simulations based on the stochastic Langevin equation are applied here to a system of two uniaxial single domain ferromagnetic particles with antiferromagnetic dipolar coupling. The hysteresis loops of a strongly coupled systems exhibit fully demagnetized, intermediate metastable configurations which separate the two fully saturated states. At small magnetostatic couplings, on the other hand, and at sufficiently weak damping, the intermediate metastable configuration becomes only partially demagnetized. This state cannot be associated with any single local minimum of the free energy function.

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