Electronic structure and finite temperature magnetism of yttrium iron garnet

Joseph Barker; Dimitar Pashov; Jerome Jackson

doi:10.1088/2516-1075/abd097

Electronic structure and finite temperature magnetism of yttrium iron garnet

Joseph Barker, Dimitar Pashov, Jerome Jackson

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Yttrium iron garnet is a complex ferrimagnetic insulator with 20 magnon modes which is used extensively in fundamental experimental studies of magnetisation dynamics. As a transition metal oxide with moderate gap (2.8 eV), yttrium iron garnet requires a careful treatment of electronic correlation. We have applied quasiparticle self-consistent GW to provide a fully ab initio description of the electronic structure and resulting magnetic properties, including the parameterisation of a Heisenberg model for magnetic exchange interactions. Subsequent spin dynamical modelling with quantum statistics extends our description to the magnon spectrum and thermodynamic properties such as the Curie temperature, finding favourable agreement with experimental measurements. This work provides a snapshot of the state-of-the art in modelling of complex magnetic insulators.

Original language	English
Pages (from-to)	044002
Journal	Electronic Structure
Volume	2
Issue number	4
DOIs	https://doi.org/10.1088/2516-1075/abd097
Publication status	Published - 17 Dec 2020

Keywords

QSGW
finite temperature spin dynamics
Heisenberg model
YIG
Questaal

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10.1088/2516-1075/abd097

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title = "Electronic structure and finite temperature magnetism of yttrium iron garnet",

abstract = "Yttrium iron garnet is a complex ferrimagnetic insulator with 20 magnon modes which is used extensively in fundamental experimental studies of magnetisation dynamics. As a transition metal oxide with moderate gap (2.8 eV), yttrium iron garnet requires a careful treatment of electronic correlation. We have applied quasiparticle self-consistent GW to provide a fully ab initio description of the electronic structure and resulting magnetic properties, including the parameterisation of a Heisenberg model for magnetic exchange interactions. Subsequent spin dynamical modelling with quantum statistics extends our description to the magnon spectrum and thermodynamic properties such as the Curie temperature, finding favourable agreement with experimental measurements. This work provides a snapshot of the state-of-the art in modelling of complex magnetic insulators.",

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author = "Joseph Barker and Dimitar Pashov and Jerome Jackson",

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doi = "10.1088/2516-1075/abd097",

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T1 - Electronic structure and finite temperature magnetism of yttrium iron garnet

AU - Barker, Joseph

AU - Pashov, Dimitar

AU - Jackson, Jerome

PY - 2020/12/17

Y1 - 2020/12/17

N2 - Yttrium iron garnet is a complex ferrimagnetic insulator with 20 magnon modes which is used extensively in fundamental experimental studies of magnetisation dynamics. As a transition metal oxide with moderate gap (2.8 eV), yttrium iron garnet requires a careful treatment of electronic correlation. We have applied quasiparticle self-consistent GW to provide a fully ab initio description of the electronic structure and resulting magnetic properties, including the parameterisation of a Heisenberg model for magnetic exchange interactions. Subsequent spin dynamical modelling with quantum statistics extends our description to the magnon spectrum and thermodynamic properties such as the Curie temperature, finding favourable agreement with experimental measurements. This work provides a snapshot of the state-of-the art in modelling of complex magnetic insulators.

AB - Yttrium iron garnet is a complex ferrimagnetic insulator with 20 magnon modes which is used extensively in fundamental experimental studies of magnetisation dynamics. As a transition metal oxide with moderate gap (2.8 eV), yttrium iron garnet requires a careful treatment of electronic correlation. We have applied quasiparticle self-consistent GW to provide a fully ab initio description of the electronic structure and resulting magnetic properties, including the parameterisation of a Heisenberg model for magnetic exchange interactions. Subsequent spin dynamical modelling with quantum statistics extends our description to the magnon spectrum and thermodynamic properties such as the Curie temperature, finding favourable agreement with experimental measurements. This work provides a snapshot of the state-of-the art in modelling of complex magnetic insulators.

KW - QSGW

KW - finite temperature spin dynamics

KW - Heisenberg model

KW - YIG

KW - Questaal

U2 - 10.1088/2516-1075/abd097

DO - 10.1088/2516-1075/abd097

M3 - Article

VL - 2

SP - 044002

JO - Electronic Structure

JF - Electronic Structure

IS - 4

ER -

Electronic structure and finite temperature magnetism of yttrium iron garnet

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Keywords

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