Out-of-equilibrium microstates but effective thermodynamics in artificial kagome ice networks

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F25%3A00639217" target="_blank" >RIV/68081731:_____/25:00639217 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216305:26210/26:0199894

Výsledek na webu

<a href="https://journals.aps.org/prb/abstract/10.1103/l8qm-5wh8" target="_blank" >https://journals.aps.org/prb/abstract/10.1103/l8qm-5wh8</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/l8qm-5wh8" target="_blank" >10.1103/l8qm-5wh8</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Out-of-equilibrium microstates but effective thermodynamics in artificial kagome ice networks

Popis výsledku v původním jazyce

Using magnetic force microscopy and Monte Carlo simulations, we investigate the low-energy properties of two artificial kagome ice structures. The two systems differ in that the first series of lattices consists of an assembly of physically disconnected nanomagnets coupled via magnetostatics, whereas the second series is made of fully connected honeycomb networks. Imaging the microstates resulting from a field demagnetization protocol, and analyzing their magnetic correlations in real and reciprocal space, we observe distinct behaviors between the two lattice types. While the former exhibits properties well described by the dipolar kagome ice model equilibrated at a finite fictional temperature, the latter instead is found systematically out of equilibrium. Remarkably, this out-of-equilibrium physics can be reformulated into an at-equilibrium one by strengthening specific coupling terms in the spin Hamiltonian. We interpret this property as a result of the field-induced domain wall propagation that arises when demagnetizing a connected network, i.e., a field driven kinetic process that competes with the formation of local flux-closure configurations that minimize the magnetostatic energy. Our findings highlight how micromagnetic effects bias the selection of spin liquid microstates during a field demagnetization protocol.

Název v anglickém jazyce

Out-of-equilibrium microstates but effective thermodynamics in artificial kagome ice networks

Popis výsledku anglicky

Using magnetic force microscopy and Monte Carlo simulations, we investigate the low-energy properties of two artificial kagome ice structures. The two systems differ in that the first series of lattices consists of an assembly of physically disconnected nanomagnets coupled via magnetostatics, whereas the second series is made of fully connected honeycomb networks. Imaging the microstates resulting from a field demagnetization protocol, and analyzing their magnetic correlations in real and reciprocal space, we observe distinct behaviors between the two lattice types. While the former exhibits properties well described by the dipolar kagome ice model equilibrated at a finite fictional temperature, the latter instead is found systematically out of equilibrium. Remarkably, this out-of-equilibrium physics can be reformulated into an at-equilibrium one by strengthening specific coupling terms in the spin Hamiltonian. We interpret this property as a result of the field-induced domain wall propagation that arises when demagnetizing a connected network, i.e., a field driven kinetic process that competes with the formation of local flux-closure configurations that minimize the magnetostatic energy. Our findings highlight how micromagnetic effects bias the selection of spin liquid microstates during a field demagnetization protocol.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

112

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

094409

Kód UT WoS článku

001569776100003

EID výsledku v databázi Scopus

2-s2.0-105019789753