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Random-field-induced disordering mechanism in a disordered ferromagnet: Between the Imry-Ma and the standard disordering mechanism
KTH, School of Engineering Sciences (SCI), Physics.
2017 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 96, no 21, article id 214414Article in journal (Refereed) Published
Abstract [en]

Random fields disorder Ising ferromagnets by aligning single spins in the direction of the random field in three space dimensions, or by flipping large ferromagnetic domains at dimensions two and below. While the former requires random fields of typical magnitude similar to the interaction strength, the latter Imry-Ma mechanism only requires infinitesimal random fields. Recently, it has been shown that for dilute anisotropic dipolar systems a third mechanism exists, where the ferromagnetic phase is disordered by finite-size glassy domains at a random field of finite magnitude that is considerably smaller than the typical interaction strength. Using large-scale Monte Carlo simulations and zero-temperature numerical approaches, we show that this mechanism applies to disordered ferromagnets with competing short-range ferromagnetic and antiferromagnetic interactions, suggesting its generality in ferromagnetic systems with competing interactions and an underlying spin-glass phase. A finite-size-scaling analysis of the magnetization distribution suggests that the transition might be first order.

Place, publisher, year, edition, pages
American Physical Society, 2017. Vol. 96, no 21, article id 214414
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-220602DOI: 10.1103/PhysRevB.96.214414ISI: 000417635700001Scopus ID: 2-s2.0-85039419701OAI: oai:DiVA.org:kth-220602DiVA, id: diva2:1174263
Note

QC 20180115

Available from: 2018-01-15 Created: 2018-01-15 Last updated: 2018-01-15Bibliographically approved

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Andresen, Juan Carlos
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