Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements

Vladimir I. Zverev; Radel R. Gimaev; Takafumi Miyanaga; Artem A. Vaulin; Andrei F. Gubkin; Boris B. Kovalev; Antonio M. dos Santos; Edmund Lovell; Lesley F. Cohen; Nikolai A. Zarkevich

doi:10.1016/j.jmmm.2020.167560

Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements

Vladimir I. Zverev, Radel R. Gimaev, Takafumi Miyanaga, Artem A. Vaulin, Andrei F. Gubkin, Boris B. Kovalev, Antonio M. dos Santos, Edmund Lovell, Lesley F. Cohen, Nikolai A. Zarkevich

Materials Engineering

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

14 Scopus citations

Abstract

We analyze coexistence of antiferromagnetic and ferromagnetic phases in bulk iron-rhodium and its alloys with palladium, Fe_50,4Rh_49,6, Fe_49,7Rh_47,4Pd_2,9 and Fe_48,3Rh_46,8Pd_4,9, using neutron diffraction, magnetization and scanning Hall probe imaging. Temperature dependencies of the lattice parameters, AFM and FM phase weight fractions, and Fe magnetic moment values were obtained on cooling and heating across the AFM-FM transition. Substantial thermomagnetic hysteresis for the phases’ weight fractions and a relatively narrow one for the unit cell volume has been observed on cooling-heating. A clear dependence of hysteretic behavior on Pd concentration has been traced. Additional direct magnetic measurements of the spatial distribution of the phase transition are acquired using scanning Hall probe microscopy, which reveals the length scale of the phase coexistence and the spatial progression of the transition in the presence of external magnetic field. Also, the magnetic phase diagram has been constructed for a series of Pd-doped FeRh alloys.

Original language	English
Article number	167560
Journal	Journal of Magnetism and Magnetic Materials
Volume	522
DOIs	https://doi.org/10.1016/j.jmmm.2020.167560
State	Published - Mar 15 2021

Funding

EL acknowledges funding from the UK EPSRC. LFC acknowledges funding from the EPSRC and InnovateUK: Project number: 105541. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This work was partly supported by the state assignment of the Ministry of Science and Higher Education (themes “Flux” No. AAAA-A18-118020190112-8 and “Alloys” № AAAA-A19-119070890020-3). EL acknowledges funding from the UK EPSRC. LFC acknowledges funding from the EPSRC and InnovateUK: Project number: 105541. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory. This work was partly supported by the state assignment of the Ministry of Science and Higher Education (themes ?Flux? No. AAAA-A18-118020190112-8 and ?Alloys? ? AAAA-A19-119070890020-3).

Keywords

FeRh
Hall probe
Neutron diffraction
Pd doped
Phase diagram

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Cite this

Zverev, V. I., Gimaev, R. R., Miyanaga, T., Vaulin, A. A., Gubkin, A. F., Kovalev, B. B., dos Santos, A. M., Lovell, E., Cohen, L. F., & Zarkevich, N. A. (2021). Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements. Journal of Magnetism and Magnetic Materials, 522, Article 167560. https://doi.org/10.1016/j.jmmm.2020.167560

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abstract = "We analyze coexistence of antiferromagnetic and ferromagnetic phases in bulk iron-rhodium and its alloys with palladium, Fe50,4Rh49,6, Fe49,7Rh47,4Pd2,9 and Fe48,3Rh46,8Pd4,9, using neutron diffraction, magnetization and scanning Hall probe imaging. Temperature dependencies of the lattice parameters, AFM and FM phase weight fractions, and Fe magnetic moment values were obtained on cooling and heating across the AFM-FM transition. Substantial thermomagnetic hysteresis for the phases{\textquoteright} weight fractions and a relatively narrow one for the unit cell volume has been observed on cooling-heating. A clear dependence of hysteretic behavior on Pd concentration has been traced. Additional direct magnetic measurements of the spatial distribution of the phase transition are acquired using scanning Hall probe microscopy, which reveals the length scale of the phase coexistence and the spatial progression of the transition in the presence of external magnetic field. Also, the magnetic phase diagram has been constructed for a series of Pd-doped FeRh alloys.",

keywords = "FeRh, Hall probe, Neutron diffraction, Pd doped, Phase diagram",

author = "Zverev, {Vladimir I.} and Gimaev, {Radel R.} and Takafumi Miyanaga and Vaulin, {Artem A.} and Gubkin, {Andrei F.} and Kovalev, {Boris B.} and {dos Santos}, {Antonio M.} and Edmund Lovell and Cohen, {Lesley F.} and Zarkevich, {Nikolai A.}",

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year = "2021",

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doi = "10.1016/j.jmmm.2020.167560",

language = "English",

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T1 - Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements

AU - Zverev, Vladimir I.

AU - Gimaev, Radel R.

AU - Miyanaga, Takafumi

AU - Vaulin, Artem A.

AU - Gubkin, Andrei F.

AU - Kovalev, Boris B.

AU - dos Santos, Antonio M.

AU - Lovell, Edmund

AU - Cohen, Lesley F.

AU - Zarkevich, Nikolai A.

PY - 2021/3/15

Y1 - 2021/3/15

N2 - We analyze coexistence of antiferromagnetic and ferromagnetic phases in bulk iron-rhodium and its alloys with palladium, Fe50,4Rh49,6, Fe49,7Rh47,4Pd2,9 and Fe48,3Rh46,8Pd4,9, using neutron diffraction, magnetization and scanning Hall probe imaging. Temperature dependencies of the lattice parameters, AFM and FM phase weight fractions, and Fe magnetic moment values were obtained on cooling and heating across the AFM-FM transition. Substantial thermomagnetic hysteresis for the phases’ weight fractions and a relatively narrow one for the unit cell volume has been observed on cooling-heating. A clear dependence of hysteretic behavior on Pd concentration has been traced. Additional direct magnetic measurements of the spatial distribution of the phase transition are acquired using scanning Hall probe microscopy, which reveals the length scale of the phase coexistence and the spatial progression of the transition in the presence of external magnetic field. Also, the magnetic phase diagram has been constructed for a series of Pd-doped FeRh alloys.

AB - We analyze coexistence of antiferromagnetic and ferromagnetic phases in bulk iron-rhodium and its alloys with palladium, Fe50,4Rh49,6, Fe49,7Rh47,4Pd2,9 and Fe48,3Rh46,8Pd4,9, using neutron diffraction, magnetization and scanning Hall probe imaging. Temperature dependencies of the lattice parameters, AFM and FM phase weight fractions, and Fe magnetic moment values were obtained on cooling and heating across the AFM-FM transition. Substantial thermomagnetic hysteresis for the phases’ weight fractions and a relatively narrow one for the unit cell volume has been observed on cooling-heating. A clear dependence of hysteretic behavior on Pd concentration has been traced. Additional direct magnetic measurements of the spatial distribution of the phase transition are acquired using scanning Hall probe microscopy, which reveals the length scale of the phase coexistence and the spatial progression of the transition in the presence of external magnetic field. Also, the magnetic phase diagram has been constructed for a series of Pd-doped FeRh alloys.

KW - FeRh

KW - Hall probe

KW - Neutron diffraction

KW - Pd doped

KW - Phase diagram

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JO - Journal of Magnetism and Magnetic Materials

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Peculiarities of the phase transformation dynamics in bulk FeRh based alloys from magnetic and structural measurements

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