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We analyze the depinning transition of a driven interface in the three-dimensional (3D) random field Ising model (RFIM) with quenched disorder by means of Monte Carlo simulations. The interface initially built into the system is perpendicular to the [111] direction of a simple cubic lattice. We introduce an algorithm which is capable of simulating such an… (More)

- Peter Entel, Vasiliy D. Buchelnikov, Markus E. Gruner, Alfred Hucht, Vladimir V. Khovailo, Sanjeev K. Nayak +1 other
- 2008

The Ni-Mn-Ga shape memory alloy displays the largest shape change of all known magnetic Heusler alloys with a strain of the order of 10% in an external magnetic field of less than one Tesla. In addition, the alloys exhibit a sequence of intermediate martensites with the modulated structures usually appearing at c/a < 1 while the low-temperature… (More)

- A Hucht, A Moschel, K D Usadel
- 2007

We simulated the classical two-dimensional anisotropic Heisenberg model with full long range di-pole interaction with an algorithm especially designed for long range models. The results show strong evidence for a rst order reorientation transition at a temperature TR < TC for appropriate parameters of the model Hamiltonian.

We investigate a two-dimensional Ising model with long-range interactions that emerge from a generalization of the magnetic dipolar interaction in spin systems with in-plane spin orientation. This interaction is, in general, anisotropic whereby in the present work we focus on the isotropic case for which the model is found to be at its upper critical… (More)

A conserved lattice gas with random neighbor hopping of active particles is introduced which exhibits a continuous phase transition from an active state to an absorbing non-active state. Since the randomness of the particle hopping breaks long range spatial correlations our model mimics the mean-field scaling behavior of the recently introduced new… (More)

A driven Ising model with friction due to magnetic correlations was proposed by Kadau [Phys. Rev. Lett. 101, 137205 (2008)]. The nonequilibrium phase transition present in this system is investigated in detail using analytical methods as well as Monte Carlo simulations. In the limit of high driving velocities v the model shows mean-field behavior due to… (More)

A new contribution to friction is predicted to occur in systems with magnetic correlations: Tangential relative motion of two Ising spin systems pumps energy into the magnetic degrees of freedom. This leads to a friction force proportional to the area of contact. The velocity and temperature dependence of this force are investigated. Magnetic friction is… (More)

- A Hucht, K D Usadel
- 2007

In this paper the thermodynamics of thin ferromagnetic lms are studied in the framework of the classical Heisenberg model with uniaxial anisotropy and long{range dipole interaction. The dependence of the order of the reorientation transition in these systems on the number of layers and on the distribution of anisotropies is investigated using both mean eld… (More)

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