scholarly journals Magnetic order and energy-scale hierarchy in artificial spin-ice structures

2018 ◽  
Vol 98 (1) ◽  
Author(s):  
Henry Stopfel ◽  
Erik Östman ◽  
Ioan-Augustin Chioar ◽  
David Greving ◽  
Unnar B. Arnalds ◽  
...  
Keyword(s):  
Magnetic Order ◽  
Energy Scale ◽  
Spin Ice ◽  
Artificial Spin Ice ◽  
Scale Hierarchy

scholarly journals String Phase in an Artificial Spin Ice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xiaoyu Zhang ◽  
Ayhan Duzgun ◽  
Yuyang Lao ◽  
Shayaan Subzwari ◽  
Nicholas S. Bingham ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Boltzmann Distribution ◽  
Energy Scale ◽  
Magnetic Interactions ◽  
Dynamic State ◽  
Santa Fe ◽  
Spin Ice ◽  
Artificial Spin Ice ◽  
Topological Quantum ◽  
Ice Lattice

AbstractOne-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 excitations in a classical system of interacting nanomagnets, the Santa Fe Ice geometry of artificial spin ice. We measured the moment configuration of the nanomagnets, both after annealing near the ferromagnetic Curie point and in a thermally dynamic state. While the Santa Fe Ice lattice structure is complex, we demonstrate that its disordered magnetic state is naturally described within a framework of emergent strings. We show experimentally that the string length follows a simple Boltzmann distribution with an energy scale that is associated with the system’s magnetic interactions and is consistent with theoretical predictions. The results demonstrate that string descriptions and associated topological characteristics are not unique to quantum models but can also provide a simplifying description of complex classical systems with non-trivial frustration.

scholarly journals Bilayer artificial spin ice: Magnetic force switching and basic thermodynamics

2021 ◽  
Vol 129 (5) ◽  
pp. 053901
Author(s):  
Fabio S. Nascimento ◽  
Afranio R. Pereira ◽  
Winder A. Moura-Melo
Keyword(s):  
Magnetic Force ◽  
Spin Ice ◽  
Artificial Spin Ice

scholarly journals Switchable X-Ray Orbital Angular Momentum from an Artificial Spin Ice

2021 ◽  
Vol 126 (11) ◽  
Author(s):  
Justin S. Woods ◽  
Xiaoqian M. Chen ◽  
Rajesh V. Chopdekar ◽  
Barry Farmer ◽  
Claudio Mazzoli ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Orbital Angular Momentum ◽  
Spin Ice ◽  
X Ray ◽  
Artificial Spin Ice

scholarly journals Field-Induced Magnetic Monopole Plasma in Artificial Spin Ice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
M. Goryca ◽  
X. Zhang ◽  
J. Li ◽  
A. L. Balk ◽  
J. D. Watts ◽  
...  
Keyword(s):  
Magnetic Monopole ◽  
Spin Ice ◽  
Artificial Spin Ice

scholarly journals Spin-ice physics in cadmium cyanide

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chloe S. Coates ◽  
Mia Baise ◽  
Adrian Schmutzler ◽  
Arkadiy Simonov ◽  
Joshua W. Makepeace ◽  
...  
Keyword(s):  
Dipole Moments ◽  
Interaction Strength ◽  
Magnetic Interaction ◽  
Energy Scale ◽  
Spin Ice ◽  
Structural Behaviour ◽  
Geometric Frustration ◽  
Cadmium Cyanide ◽  
The Difference ◽  
Increased Strength

AbstractSpin-ices are frustrated magnets that support a particularly rich variety of emergent physics. Typically, it is the interplay of magnetic dipole interactions, spin anisotropy, and geometric frustration on the pyrochlore lattice that drives spin-ice formation. The relevant physics occurs at temperatures commensurate with the magnetic interaction strength, which for most systems is 1–5 K. Here, we show that non-magnetic cadmium cyanide, Cd(CN)2, exhibits analogous behaviour to magnetic spin-ices, but does so on a temperature scale that is nearly two orders of magnitude greater. The electric dipole moments of cyanide ions in Cd(CN)2 assume the role of magnetic pseudospins, with the difference in energy scale reflecting the increased strength of electric vs magnetic dipolar interactions. As a result, spin-ice physics influences the structural behaviour of Cd(CN)2 even at room temperature.

scholarly journals Angular-dependent dynamic response and magnetization reversal in Fibonacci-distorted kagome artificial spin ice

2021 ◽  
Vol 103 (18) ◽  
Author(s):  
Ali Frotanpour ◽  
Justin Woods ◽  
Barry Farmer ◽  
Amrit P. Kaphle ◽  
J. Todd Hastings ◽  
...  
Keyword(s):  
Dynamic Response ◽  
Magnetization Reversal ◽  
Spin Ice ◽  
Artificial Spin Ice

scholarly journals Emergent Spin Dynamics Enabled by Lattice Interactions in a Bicomponent Artificial Spin Ice

Nano Letters ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1921-1927 ◽  
Author(s):  
Sergi Lendinez ◽  
Mojtaba T. Kaffash ◽  
M. Benjamin Jungfleisch
Keyword(s):  
Spin Dynamics ◽  
Spin Ice ◽  
Artificial Spin Ice

scholarly journals Magnetic Normal Mode Calculations in Big Systems: A Highly Scalable Dynamical Matrix Approach Applied to a Fibonacci-Distorted Artificial Spin Ice

2021 ◽  
Vol 7 (3) ◽  
pp. 34
Author(s):  
Loris Giovannini ◽  
Barry W. Farmer ◽  
Justin S. Woods ◽  
Ali Frotanpour ◽  
Lance E. De Long ◽  
...  
Keyword(s):  
Normal Modes ◽  
Low Frequency ◽  
Fibonacci Sequence ◽  
Exchange Interactions ◽  
Geometric Distortion ◽  
Dynamical Matrix ◽  
Spin Ice ◽  
Magnetization Dynamics ◽  
Distortion Parameter ◽  
Artificial Spin Ice

We present a new formulation of the dynamical matrix method for computing the magnetic normal modes of a large system, resulting in a highly scalable approach. The motion equation, which takes into account external field, dipolar and ferromagnetic exchange interactions, is rewritten in the form of a generalized eigenvalue problem without any additional approximation. For its numerical implementation several solvers have been explored, along with preconditioning methods. This reformulation was conceived to extend the study of magnetization dynamics to a broader class of finer-mesh systems, such as three-dimensional, irregular or defective structures, which in recent times raised the interest among researchers. To test its effectiveness, we applied the method to investigate the magnetization dynamics of a hexagonal artificial spin-ice as a function of a geometric distortion parameter following the Fibonacci sequence. We found several important features characterizing the low frequency spin modes as the geometric distortion is gradually increased.

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