Imaging the stochastic microstructure and dynamic development of correlations in perpendicular artificial spin ice
arXiv:1904.06625 · doi:10.1103/PhysRevResearch.2.012001
Abstract
We use spatially resolved magneto-optical Kerr microscopy to track the complete microstates of arrays of perpendicular anisotropy nanomagnets during magnetization hysteresis cycles. These measurements allow us to disentangle the intertwined effects of nearest neighbor interaction, disorder, and stochasticity on magnetization switching. We find that the nearest neighbor correlations depend on both interaction strength and disorder. We also find that although the global characteristics of the hysteretic switching are repeatable, the exact microstate sampled is stochastic with the behavior of individual islands varying between nonminally identical runs.
References in corpus (11)
- Artificial "spin ice" in a geometrically frustrated lattice of nanoscale ferromagnetic islands
- Extensive degeneracy, Coulomb phase and magnetic monopoles in an artificial realization of the square ice model
- Magnetic monopole and string excitations in a two-dimensional spin ice
- Perpendicular Magnetization and Generic Realization of the Ising Model in Artificial Spin Ice
- From laterally modulated two-dimensional electron gas towards artificial graphene
- Direct Visualization of Memory Effects in Artificial Spin Ice
- Magneto-optical Kerr Effect Studies of Square Artificial Spin Ice
- Non-universality of artificial frustrated spin systems
- Superferromagnetism and domain-wall topologies in artificial 'pinwheel' spin ice
- Dynamics and hysteresis in square lattice artificial spin-ice
- Characterization of switching field distributions in Ising-like magnetic arrays
Cited by in corpus (6)
- Experimental Realization of the 1D Random Field Ising Model
- Field-tunable interactions and frustration in underlayer-mediated artificial spin ice
- Artificial Spin Ice: A Tutorial on Design and Control of Geometry, Microstate, Magnon Dynamics & Neuromorphic Computing
- Bilayer artificial spin ice: magnetic force switching and basic thermodynamics
- Field-driven Reversal Models in Artificial Spin Ice
- Perpendicular-anisotropy artificial spin ice with spontaneous ordering: a platform for neuromorphic computing with flexible timescales