Magnetic field dependent thermodynamic properties of square and quadrupolar artificial spin ice

被引：7

作者：

Goryca, M. ^{[1
,2
]}

Zhang, X. ^{[3
]}

Watts, J. D. ^{[4
,5
]}

Nisoli, C. ^{[6
]}

Leighton, C. ^{[4
]}

Schiffer, P. ^{[3
,7
]}

Crooker, S. A. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[2] Univ Warsaw, Fac Phys, Inst Expt Phys, Pasteura 5, PL-02093 Warsaw, Poland

[3] Yale Univ, Dept Appl Phys, New Haven, CT 06520 USA

[4] Univ Minnesota, Dept Chem Engn & Mat Sci, Minneapolis, MN 55455 USA

[5] Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA

[6] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

[7] Yale Univ, Dept Phys, New Haven, CT 06520 USA

来源：

PHYSICAL REVIEW B | 2022年 / 105卷 / 09期

基金：

美国国家科学基金会;

关键词：

GEOMETRICAL FRUSTRATION; MONOPOLES;

D O I：

10.1103/PhysRevB.105.094406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Applied magnetic fields are an important tuning parameter for artificial spin ice (ASI) systems, as they can drive phase transitions between different magnetic ground states or tune through regimes with high populations of emergent magnetic excitations (e.g., monopole-like quasiparticles). Here, using simulations supported by experiments, we investigate the thermodynamic properties and magnetic phases of square and quadrupolar ASI as a function of applied in-plane magnetic fields. Monte Carlo simulations are used to generate field-dependent maps of the magnetization, the magnetic specific heat, the thermodynamic magnetization fluctuations, and the magnetic order parameters, all under equilibrium conditions. These maps reveal the diversity of magnetic orderings and the phase transitions that occur in different regions of the phase diagrams of these ASIs, and are experimentally supported by magnetooptical measurements of the equilibrium "magnetization noise" in thermally active ASIs.

引用

页数：11

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