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Origin and dynamics of umbrella states in rare-earth iron garnets

Tomasello, Bruno, Mannix, Dan, Geprägs, Stephan, Ziman, Timothy (2022) Origin and dynamics of umbrella states in rare-earth iron garnets. Annals of Physics, 447 . Article Number 169117. ISSN 0003-4916. (doi:10.1016/j.aop.2022.169117) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:98659)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL:
https://doi.org/10.1016/j.aop.2022.169117

Abstract

Rare-earth iron garnets R3Fe5O12 are fascinating insulators with very diverse magnetic phases. Their strong potential in spintronic devices has encouraged a renewal of interest in the study of their low temperature spin structures and spin wave dynamics. A striking feature of rare-earth garnets with R-ions exhibiting strong crystal-field effects like Tb-, Dy-, Ho-, Er-, Tm- and Yb-ions is the observation of low-temperature non-collinear magnetic structures featuring “umbrella-like” arrangements of the rare-earth magnetic moments. In this study, we demonstrate that such umbrella magnetic states are naturally emerging from the crystal-field anisotropies of the rare-earth ions. By means of a general model endowed with only the necessary elements from the crystal structure, we show how umbrella-like spin structures can take place and calculate the canting-angle as a result of the competition between the exchange-interaction of the rare-earth and the iron ions as well as the crystal-field anisotropy. Our results are compared to experimental data, and a study of the polarised spin wave dynamics is presented. Our study improves the understanding of umbrella-like spin structures and paves the way for more complex spin wave calculations in rare-earth iron garnets with non-collinear magnetic phases.

Item Type: Article
DOI/Identification number: 10.1016/j.aop.2022.169117
Uncontrolled keywords: Rare-Earth Iron Garnet; Magnetic Anisotropy; Magnetic Order; Ferrimagnetism; Chirality; Spintronics
Subjects: Q Science
Q Science > QC Physics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Funders: International Centre for Advanced Materials (United Kingdom) (https://ror.org/0405v9k44)
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 03 Feb 2023 14:51 UTC
Last Modified: 23 Aug 2024 14:45 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/98659 (The current URI for this page, for reference purposes)

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