76 citations · 158 across the 6 of their papers we have counts for
7 papers
Intrinsic excitations and a proposed ground state in an Ammann-Beenker artificial spin ice
E Weightman, L O'Brien, S Coates
Artificial spin ices built on quasiperiodic geometries remain under-explored. Here we investigate an ASI based on the octagonal Ammann-Beenker tiling, whose six vertex types presen…
Entropy-driven order in an array of nanomagnets
Hilal Saglam, Ayhan Duzgun, Aikaterini Kargioti +14
Long-range ordering is typically associated with a decrease in entropy. Yet, it can also be driven by increasing entropy in certain special cases. We demonstrate that artificial sp…
String Phase in an Artificial Spin Ice
Xiaoyu Zhang, Ayhan Duzgun, Yuyang Lao +13
One-dimensional strings of local excitations are a fascinating feature of the physical behavior of strongly correlated topological quantum matter. Here we study strings of local ex…
Theory of Kondo suppression of spin polarization in nonlocal spin valves
Kyoung-Whan Kim, Liam O'Brien, Paul A. Crowell +2
We theoretically analyze contributions from the Kondo effect to the spin polarization and spin diffusion length in all-metal nonlocal spin valves. Interdiffusion of ferromagnetic a…
Resonance in Magnetostatically Coupled Transverse Domain Walls
Andrew T. Galkiewicz, Liam O'Brien, Paul S. Keatley +2
We have observed the eigenmodes of coupled transverse domain walls in a pair of ferromagnetic nanowires. Although the pair is coupled magnetostatically, its spectrum is determined…
Coupling and induced depinning of magnetic domain walls in adjacent spin valve nanotracks
J. Sampaio, L. O'Brien, D. Petit +6
The magnetostatic interaction between magnetic domain walls (DWs) in adjacent nanotracks has been shown to produce strong inter-DW coupling and mutual pinning. In this paper, we ha…
Near-field interaction between domain walls in adjacent Permalloy nanowires
Liam O'Brien, D. Petit, H. T. Zeng +5
The magnetostatic interaction between two oppositely charged transverse domain walls (DWs)in adjacent Permalloy nanowires is experimentally demonstrated. The dependence of the pinn…