Observation of dynamic scaling of magnetic hysteresis in ultrathin ferromagnetic Fe/Au(001) films

He, Yuan; Wang, G.-C.

doi:10.1103/physrevlett.70.2336

Cited by 175 publications

(126 citation statements)

References 17 publications

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“…If we increase the frequency further, these elliptical loops become horizontal lines. Related to the frequency evolutions of the hysteresis curves, we should also note that a qualitative consistency is found between our numerical findings and experimental observations [32,35,50].…”

Section: Resultssupporting

confidence: 89%

Investigation of oscillation frequency and disorder induced dynamic phase transitions in a quenched-bond diluted Ising ferromagnet

Vatansever¹,

Akıncı²,

Yüksel³

et al. 2013

Journal of Magnetism and Magnetic Materials

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Frequency evolutions of hysteresis loop area and hysteresis tools such as remanence and coercivity of a kinetic Ising model in the presence of quenched bond dilution are investigated in detail. The kinetic equation describing the time dependence of the magnetization is derived by means of effectivefield theory with single-site correlations. It is found that the frequency dispersions of hysteresis loop area, remanence and coercivity strongly depend on the quenched bond randomness, as well as applied field amplitude and oscillation frequency. In addition, the shape of the hysteresis curves for a wide variety of Hamiltonian parameters is studied and some interesting behaviors are found. Finally, a comparison of our observations with those of recently published studies is represented and it is shown that there exists a qualitatively good agreement.

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Section: Resultssupporting

confidence: 89%

Investigation of oscillation frequency and disorder induced dynamic phase transitions in a quenched-bond diluted Ising ferromagnet

Vatansever¹,

Akıncı²,

Yüksel³

et al. 2013

Journal of Magnetism and Magnetic Materials

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“…This simple model has, for example, been shown to be appropriate for describing magnetization dynamics in highly anisotropic single-domain nanoparticles and uniaxial thin films [18,19,20,40]. Despite its simplicity, it is believed to capture the generic features of periodically driven, spatially extended bistable systems.…”

Section: Simulation Results and Finite-size Effectsmentioning

confidence: 99%

Absence of first-order transition and tricritical point in the dynamic phase diagram of a spatially extended bistable system in an oscillating field

2002

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It has been well established that spatially extended, bistable systems that are driven by an oscillating field exhibit a nonequilibrium dynamic phase transition (DPT). The DPT occurs when the field frequency is on the order of the inverse of an intrinsic lifetime associated with the transitions between the two stable states in a static field of the same magnitude as the amplitude of the oscillating field. The DPT is continuous and belongs to the same universality class as the equilibrium phase transition of the Ising model in zero field [G. Korniss et al., Phys. Rev. E 63, 016120 (2001); H. Fujisaka et al., Phys. Rev. E 63, 036109 (2001)]. However, it has previously been claimed that the DPT becomes discontinuous at temperatures below a tricritical point [M. Acharyya, Phys. Rev. E 59, 218 (1999)]. This claim was based on observations in dynamic Monte Carlo simulations of a multipeaked probability density for the dynamic order parameter and negative values of the fourthorder cumulant ratio. Both phenomena can be characteristic of discontinuous phase transitions. Here we use classical nucleation theory for the decay of metastable phases, together with data from large-scale dynamic Monte Carlo simulations of a two-dimensional kinetic Ising ferromagnet, to show that these observations in this case are merely finite-size effects. For sufficiently small systems and low temperatures, the continuous DPT is replaced, not by a discontinuous phase transition, but by a crossover to stochastic resonance. In the infinite-system limit the stochastic-resonance regime vanishes, and the continuous DPT should persist for all nonzero temperatures.

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“…The frequency and field amplitude dependence of the hysteretic behavior in ferromagnets has been extensively studied both experimentally [1][2][3][4] and theoretically. [5][6][7][8][9][10][11][12][13] For the two-dimensional kinetic Ising model below its equilibrium critical temperature, a finite-size scaling analysis of large-scale Monte Carlo simulations has shown that the DPT is in the same universality class as the equilibrium Ising model.…”

Section: Introductionmentioning

confidence: 99%

Dynamic phase transitions in thin ferromagnetic films

2003

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Monte Carlo simulations have been used to investigate the dynamic phase behavior of a classical Heisenberg spin system with a bilinear exchange anisotropy Λ in a planar thin film geometry. Studies of the field amplitude, frequency and temperature dependence show dynamic phase transitions in films subject to a pulsed oscillatory external field. Thin films with competing surface fields show separate and distinct dynamic phase transitions for the bulk and surface layers of the film. Between the two transitions, a mixed state with coexisting dynamically ordered and dynamically disordered phases is observed in the film. In contrast, the free film with no surface fields shows a single dynamic phase transition as in a bulk system. PACS number(s) : 75.40.Mg,

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Observation of dynamic scaling of magnetic hysteresis in ultrathin ferromagnetic Fe/Au(001) films

Cited by 175 publications

References 17 publications

Investigation of oscillation frequency and disorder induced dynamic phase transitions in a quenched-bond diluted Ising ferromagnet

Investigation of oscillation frequency and disorder induced dynamic phase transitions in a quenched-bond diluted Ising ferromagnet

Absence of first-order transition and tricritical point in the dynamic phase diagram of a spatially extended bistable system in an oscillating field

Dynamic phase transitions in thin ferromagnetic films

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