Abstract
We have investigated the micro-magnetic behavior as well as magnetization reversal of dipolar coupled magnetic nanoislands with strong shape anisotropy arranged in a square artificial spin ice geometry. Our 0 K-temperature simulation results show that metastable two-in two-out state is stabilized at remanence of regular configurations. A complex interplay of defects and dipolar interaction leads to a predictable three-in one-out or three-out one-in higher energy state. Switching of the magnetic states is defined by the reduction of the no. of high-energy head-to-head or tail-to tail magnetic state.
Highlights
Exchange interactions are responsible for ordered magnetic ground states of most materials which are available in nature
The role of strong dipolar interactions was observed for a bulk tetrahedral pyrochlore system, such as Ho2Ti2O7, where Ho is the only magnetic element with large magnetic moment of 10 μB which behaves as uniaxial Ising-like spins due to crystal-field effect.[2,3]
Such magnetic systems, named as spin ice, are one of the candidates for exploring the physics of magnetic frustration resulting from strong dipolar interactions
Summary
Exchange interactions are responsible for ordered magnetic ground states of most materials which are available in nature. Magnetization reversal and emergent magnetic monopole-like state in square artificial spin ice vertex with defects
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