Control of emergent magnetic monopole currents in artificial spin ice

2020 ◽  
Vol 102 (14) ◽  
Author(s):  
H. Arava ◽  
E. Y. Vedmedenko ◽  
J. Cui ◽  
J. Vijayakumar ◽  
A. Kleibert ◽  
...  
Keyword(s):  
Magnetic Monopole ◽  
Spin Ice ◽  
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 Disorder-independent control of magnetic monopole defect population in artificial spin-ice honeycombs

2012 ◽  
Vol 14 (4) ◽  
pp. 045010 ◽  
Author(s):  
S Ladak ◽  
S K Walton ◽  
K Zeissler ◽  
T Tyliszczak ◽  
D E Read ◽  
...  
Keyword(s):  
Magnetic Monopole ◽  
Spin Ice ◽  
Independent Control ◽  
Artificial Spin Ice

scholarly journals Emergent magnetic monopole dynamics in macroscopically degenerate artificial spin ice

2019 ◽  
Vol 5 (2) ◽  
pp. eaav6380 ◽  
Author(s):  
Alan Farhan ◽  
Michael Saccone ◽  
Charlotte F. Petersen ◽  
Scott Dhuey ◽  
Rajesh V. Chopdekar ◽  
...  
Keyword(s):  
Magnetic Monopole ◽  
Topological Defects ◽  
Magnetic Monopoles ◽  
Real Space ◽  
Spin Ice ◽  
Solid State Physics ◽  
Pinch Point ◽  
Topological Excitations ◽  
Artificial Spin Ice ◽  
Hückel Theory

Magnetic monopoles, proposed as elementary particles that act as isolated magnetic south and north poles, have long attracted research interest as magnetic analogs to electric charge. In solid-state physics, a classical analog to these elusive particles has emerged as topological excitations within pyrochlore spin ice systems. We present the first real-time imaging of emergent magnetic monopole motion in a macroscopically degenerate artificial spin ice system consisting of thermally activated Ising-type nanomagnets lithographically arranged onto a pre-etched silicon substrate. A real-space characterization of emergent magnetic monopoles within the framework of Debye-Hückel theory is performed, providing visual evidence that these topological defects act like a plasma of Coulomb-type magnetic charges. In contrast to vertex defects in a purely two-dimensional artificial square ice, magnetic monopoles are free to evolve within a divergence-free vacuum, a magnetic Coulomb phase, for which features in the form of pinch-point singularities in magnetic structure factors are observed.

scholarly journals Controlled creation and annihilation of isolated robust emergent magnetic monopole like charged vertices in square artificial spin ice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Neeti Keswani ◽  
Ricardo J. C. Lopes ◽  
Yoshikata Nakajima ◽  
Ranveer Singh ◽  
Neha Chauhan ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Monopole ◽  
Magnetic Charge ◽  
Direct Visualization ◽  
South Pole ◽  
Spin Ice ◽  
Opposite Charge ◽  
Artificial Spin Ice ◽  
Thermally Driven ◽  
Classical Analogue

AbstractMagnetic analogue of an isolated free electric charge, i.e., a magnet with a single north or south pole, is a long sought-after particle which remains elusive so far. In magnetically frustrated pyrochlore solids, a classical analogue of monopole was observed as a result of excitation of spin ice vertices. Direct visualization of such excitations were proposed and later confirmed in analogous artificial spin ice (ASI) systems of square as well as Kagome geometries. However, such magnetically charged vertices are randomly created as they are thermally driven and are always associated with corresponding equal and opposite emergent charges, often termed as monopole–antimonopole pairs, connected by observable strings. Here, we demonstrate a controlled stabilisation of a robust isolated emergent monopole-like magnetically charged vertices in individual square ASI systems by application of an external magnetic field. The excitation conserves the magnetic charge without the involvement of a corresponding excitation of opposite charge. Well supported by Monte Carlo simulations our experimental results enable, in absence of a true elemental magnetic monopole, creation of electron vortices and studying electrodynamics in presence of a monopole-like field in a solid state environment.

scholarly journals Direct observation of magnetic monopole defects in an artificial spin-ice system

2010 ◽  
Vol 6 (5) ◽  
pp. 359-363 ◽  
Author(s):  
S. Ladak ◽  
D. E. Read ◽  
G. K. Perkins ◽  
L. F. Cohen ◽  
W. R. Branford
Keyword(s):  
Direct Observation ◽  
Magnetic Monopole ◽  
Spin Ice ◽  
Artificial Spin Ice

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
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