Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session W19: Spin Ice - From Freezing to Cerenkov Radiation
8:00 AM–11:00 AM,
Friday, March 6, 2020
Room: 207
Sponsoring
Unit:
GMAG
Chair: Kate Ross, Colorado State University
Abstract: W19.00001 : Tuning dipolar interactions in artificial spin ices - From Ising to Potts spins
Presenter:
Francois Montaigne
(Universite de Lorraine)
Authors:
Francois Montaigne
(Universite de Lorraine)
Damien Louis
(Universite de Lorraine)
Maryam Massouras
(Universite de Lorraine)
Michel Hehn
(Universite de Lorraine)
Thomas Hauet
(Universite de Lorraine)
Daniel Lacour
(Universite de Lorraine)
In this talk, we introduce the dipolar 4-state Potts model. It is shown that on a square lattice, depending on the angle between spins and lattice, the system present very different properties like antiferromagnetic order, spin ice state (2 in-2 out ice rule) and even dipolar ferromagnetism.
This model has been realized experimentally. At room temperature, the magnets present a uniform state with 4 equivalent directions. Upon heating at 350 °C the magnets switch from one direction to another. It is therefore possible to simply drive the system toward its ground state. The magnetic configurations determined by magnetic force microscopy reveals the importance of the dipolar coupling as the different expected ground states (antiferromagnetic, spin ice and ferromagnetic) are indeed observed [3]. It is noticeable that these very different properties are obtained with the same "spins" (magnetic elements) and same lattice. The exact process of magnetization evolution, differences with "Ising" systems and future prospects will be discussed.
[1] R. F. Wang et al., Nature 439, 04447 (2006)
[2] C. Nisoli et al., Rev. Mod. Phys. 85, 1473 (2013) and L.J. Heyderman and R.L. Stamps, J.of Physics: Cond. Matter 25, 363201 (2013)
[3] D. Louis et al., Nat. Mat. 17, 1076 (2018)
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