A Model of the Electronic Structure of a FeRh Alloy Undergoing an Antferromagnetic–Ferromagnetic Phase Transition

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A Model of the Electronic Structure of a FeRh Alloy Undergoing an Antferromagnetic–Ferromagnetic Phase Transition. / Kurkin, M. I.; Telegin, A. V.; Agzamova, P. A. et al.
In: Physics of Metals and Metallography, Vol. 123, No. 6, 01.06.2022, p. 543-551.

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

BibTeX

@article{4ca6fb432bd748bca77464d9f2b23dad,

title = "A Model of the Electronic Structure of a FeRh Alloy Undergoing an Antferromagnetic–Ferromagnetic Phase Transition",

abstract = "A new approach to describing the magnetic properties of FeRh alloys is proposed. It is based on two assumptions about the properties of 3d and 4d electrons in these alloys. The first is the assumption that the 4d band is submerged under the Fermi level to a depth that ensures its complete filling at a temperature T = 0 K. The second is the assumption that there are two different spatial distributions of 3d and 4d electrons that are compatible with one atomic structure. The first assumption makes it possible to explain the absence of uncompensated spins of 4d electrons in the low-temperature antiferromagnetic (AFM) phase of FeRh. The second assumption is proposed to explain the strong changes in the spin structure of the FeRh alloy upon the AFM–FM transition, while its atomic structure is almost unchanged. Attempts have been made to predict the new properties of the FeRh alloy that follow from these assumptions. Our second assumption proved to be successful and enabled us to predict the existence of local magnetic moments of 3d electrons in the AFM phase, which are larger than the magnetic moments of Fe ions. Measurements of the magnetic susceptibility of the FeRh alloy in the AFM phase confirmed this prediction.",

keywords = "AFM–FM phase transition, delocalized electrons, electronic structure model, FeRh alloy, magnetic susceptibility",

author = "Kurkin, {M. I.} and Telegin, {A. V.} and Agzamova, {P. A.} and Bessonov, {V. D.} and Neznakhin, {D. S.} and Baranov, {N. V.}",

year = "2022",

month = jun,

day = "1",

doi = "10.1134/S0031918X22060102",

language = "English",

volume = "123",

pages = "543--551",

journal = "Physics of Metals and Metallography",

issn = "0031-918X",

publisher = "Maik Nauka-Interperiodica Publishing",

number = "6",

}

RIS

TY - JOUR

T1 - A Model of the Electronic Structure of a FeRh Alloy Undergoing an Antferromagnetic–Ferromagnetic Phase Transition

AU - Kurkin, M. I.

AU - Telegin, A. V.

AU - Agzamova, P. A.

AU - Bessonov, V. D.

AU - Neznakhin, D. S.

AU - Baranov, N. V.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - A new approach to describing the magnetic properties of FeRh alloys is proposed. It is based on two assumptions about the properties of 3d and 4d electrons in these alloys. The first is the assumption that the 4d band is submerged under the Fermi level to a depth that ensures its complete filling at a temperature T = 0 K. The second is the assumption that there are two different spatial distributions of 3d and 4d electrons that are compatible with one atomic structure. The first assumption makes it possible to explain the absence of uncompensated spins of 4d electrons in the low-temperature antiferromagnetic (AFM) phase of FeRh. The second assumption is proposed to explain the strong changes in the spin structure of the FeRh alloy upon the AFM–FM transition, while its atomic structure is almost unchanged. Attempts have been made to predict the new properties of the FeRh alloy that follow from these assumptions. Our second assumption proved to be successful and enabled us to predict the existence of local magnetic moments of 3d electrons in the AFM phase, which are larger than the magnetic moments of Fe ions. Measurements of the magnetic susceptibility of the FeRh alloy in the AFM phase confirmed this prediction.

AB - A new approach to describing the magnetic properties of FeRh alloys is proposed. It is based on two assumptions about the properties of 3d and 4d electrons in these alloys. The first is the assumption that the 4d band is submerged under the Fermi level to a depth that ensures its complete filling at a temperature T = 0 K. The second is the assumption that there are two different spatial distributions of 3d and 4d electrons that are compatible with one atomic structure. The first assumption makes it possible to explain the absence of uncompensated spins of 4d electrons in the low-temperature antiferromagnetic (AFM) phase of FeRh. The second assumption is proposed to explain the strong changes in the spin structure of the FeRh alloy upon the AFM–FM transition, while its atomic structure is almost unchanged. Attempts have been made to predict the new properties of the FeRh alloy that follow from these assumptions. Our second assumption proved to be successful and enabled us to predict the existence of local magnetic moments of 3d electrons in the AFM phase, which are larger than the magnetic moments of Fe ions. Measurements of the magnetic susceptibility of the FeRh alloy in the AFM phase confirmed this prediction.

KW - AFM–FM phase transition

KW - delocalized electrons

KW - electronic structure model

KW - FeRh alloy

KW - magnetic susceptibility

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U2 - 10.1134/S0031918X22060102

DO - 10.1134/S0031918X22060102

M3 - Article

VL - 123

SP - 543

EP - 551

JO - Physics of Metals and Metallography

JF - Physics of Metals and Metallography

SN - 0031-918X

IS - 6

ER -

ID: 30943780