Landau-Lifshitz-Bloch equation for exchange coupled grains
arXiv:1410.6066 · doi:10.1103/PhysRevB.90.214431
Abstract
Heat assisted recording is a promising technique to further increase the storage density in hard disks. Multilayer recording grains with graded Curie temperature is discussed to further assist the write process. Describing the correct magnetization dynamics of these grains, from room temperature to far above the Curie point, during a write process is required for the calculation of bit error rates. We present a coarse grained approach based on the Landau-Lifshitz-Bloch (LLB) equation to model exchange coupled grains with low computational effort. The required temperature dependent material properties such as the zero-field equilibrium magnetization as well as the parallel and normal susceptibilities are obtained by atomistic Landau-Lifshitz-Gilbert (LLG) simulations. Each grain is described with one magnetization vector. In order to mimic the atomistic exchange interaction between the grains a special treatment of the exchange field in the coarse grained approach is presented.
References in corpus (2)
Cited by in corpus (8)
- Perspective: Ultrafast magnetism and THz spintronics
- Fundamental limits in heat assisted magnetic recording and methods to overcome it with exchange spring structures
- Dependence of energy barrier reduction on collective excitations in square artificial spin ice: A comprehensive comparison of simulation techniques
- Models of Advance Recording Systems: A Multi-timescale Micromagnetic code for granular thin film magnetic recording systems
- AC noise reduction based on exchange coupled grains for heat-assisted-magnetic recording: The effect of an FeRh interlayer
- Influence of grain size and exchange interaction on the LLB modeling procedure
- Ultrafast dynamics of moments in bulk ferromagnets
- Full-Spin-Wave-Scaled Finite Element Stochastic Micromagnetism: Mesh-Independent FUSSS LLG Simulations of Ferromagnetic Resonance and Reversal