Element-specific Curie temperatures and Heisenberg criticality in ferrimagnetic Gd6(Mn1−xFex)23 via Kouvel-Fisher analysis

Truc Ly Nguyen; Thomas Mazet; Émilie Gaudry; Daniel Malterre; Fan Hsiu Chang; Hong Ji Lin; Chien Te Chen; Yuan Chieh Tseng; Ashish Chainani

doi:10.1038/s43246-024-00496-2

Element-specific Curie temperatures and Heisenberg criticality in ferrimagnetic Gd₆(Mn_1−xFe_x)₂₃ via Kouvel-Fisher analysis

Truc Ly Nguyen, Thomas Mazet, Émilie Gaudry, Daniel Malterre, Fan Hsiu Chang, Hong Ji Lin, Chien Te Chen, Yuan Chieh Tseng, Ashish Chainani^*

^*Corresponding author for this work

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

Abstract

Many large unit-cell rare-earth transition metal ternary alloys of the type R_a(M_1−xM’_x)_b exhibit non-monotonic ferrimagnetic Curie temperatures (T_C) coupled to monotonic composition-controlled magnetization. Its origin remains an important long-standing puzzle in the absence of studies probing their temperature-dependent element-specific magnetism. Here, in order to resolve this issue and identify design principles for new R-M-M’ permanent magnets, we carry out x-ray magnetic circular dichroism (XMCD) for the series Gd₆(Mn_1−xFe_x)₂₃, x = 0.0 − 0.75. The results show that the net Mn-moment reduces and switches from parallel to antiparallel for x ≥ 0.2, while the Fe-moment is always antiparallel to the Gd-moment. Kouvel-Fisher analyses of XMCD data reveals distinct sublattice T_C’s and 3D Heisenberg criticality. Band structure calculations show magnetic moments and density of states consistent with experiments. The magnetic phase diagram shows three regions characterized by (i) Mn-sublattice bulk-T_C > Gd-sublattice T_C, (ii) a reduced common-T_C for all sublattices, and (iii) Fe-sublattice bulk-T_C > Gd-sublattice T_C. The Mn-moment switching and gradual increase of Fe-moment combine to cause non-monotonic T_C’s with monotonic magnetization. The study indicates the importance of element-specific T_C’s for tuning magnetic properties.

Original language	English
Article number	68
Journal	Communications Materials
Volume	5
Issue number	1
DOIs	https://doi.org/10.1038/s43246-024-00496-2
State	Published - Dec 2024

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title = "Element-specific Curie temperatures and Heisenberg criticality in ferrimagnetic Gd6(Mn1−xFex)23 via Kouvel-Fisher analysis",

abstract = "Many large unit-cell rare-earth transition metal ternary alloys of the type Ra(M1−xM{\textquoteright}x)b exhibit non-monotonic ferrimagnetic Curie temperatures (TC) coupled to monotonic composition-controlled magnetization. Its origin remains an important long-standing puzzle in the absence of studies probing their temperature-dependent element-specific magnetism. Here, in order to resolve this issue and identify design principles for new R-M-M{\textquoteright} permanent magnets, we carry out x-ray magnetic circular dichroism (XMCD) for the series Gd6(Mn1−xFex)23, x = 0.0 − 0.75. The results show that the net Mn-moment reduces and switches from parallel to antiparallel for x ≥ 0.2, while the Fe-moment is always antiparallel to the Gd-moment. Kouvel-Fisher analyses of XMCD data reveals distinct sublattice TC{\textquoteright}s and 3D Heisenberg criticality. Band structure calculations show magnetic moments and density of states consistent with experiments. The magnetic phase diagram shows three regions characterized by (i) Mn-sublattice bulk-TC > Gd-sublattice TC, (ii) a reduced common-TC for all sublattices, and (iii) Fe-sublattice bulk-TC > Gd-sublattice TC. The Mn-moment switching and gradual increase of Fe-moment combine to cause non-monotonic TC{\textquoteright}s with monotonic magnetization. The study indicates the importance of element-specific TC{\textquoteright}s for tuning magnetic properties.",

author = "Nguyen, {Truc Ly} and Thomas Mazet and {\'E}milie Gaudry and Daniel Malterre and Chang, {Fan Hsiu} and Lin, {Hong Ji} and Chen, {Chien Te} and Tseng, {Yuan Chieh} and Ashish Chainani",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

month = dec,

doi = "10.1038/s43246-024-00496-2",

language = "English",

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T1 - Element-specific Curie temperatures and Heisenberg criticality in ferrimagnetic Gd6(Mn1−xFex)23 via Kouvel-Fisher analysis

AU - Nguyen, Truc Ly

AU - Mazet, Thomas

AU - Gaudry, Émilie

AU - Malterre, Daniel

AU - Chang, Fan Hsiu

AU - Lin, Hong Ji

AU - Chen, Chien Te

AU - Tseng, Yuan Chieh

AU - Chainani, Ashish

PY - 2024/12

Y1 - 2024/12

N2 - Many large unit-cell rare-earth transition metal ternary alloys of the type Ra(M1−xM’x)b exhibit non-monotonic ferrimagnetic Curie temperatures (TC) coupled to monotonic composition-controlled magnetization. Its origin remains an important long-standing puzzle in the absence of studies probing their temperature-dependent element-specific magnetism. Here, in order to resolve this issue and identify design principles for new R-M-M’ permanent magnets, we carry out x-ray magnetic circular dichroism (XMCD) for the series Gd6(Mn1−xFex)23, x = 0.0 − 0.75. The results show that the net Mn-moment reduces and switches from parallel to antiparallel for x ≥ 0.2, while the Fe-moment is always antiparallel to the Gd-moment. Kouvel-Fisher analyses of XMCD data reveals distinct sublattice TC’s and 3D Heisenberg criticality. Band structure calculations show magnetic moments and density of states consistent with experiments. The magnetic phase diagram shows three regions characterized by (i) Mn-sublattice bulk-TC > Gd-sublattice TC, (ii) a reduced common-TC for all sublattices, and (iii) Fe-sublattice bulk-TC > Gd-sublattice TC. The Mn-moment switching and gradual increase of Fe-moment combine to cause non-monotonic TC’s with monotonic magnetization. The study indicates the importance of element-specific TC’s for tuning magnetic properties.

AB - Many large unit-cell rare-earth transition metal ternary alloys of the type Ra(M1−xM’x)b exhibit non-monotonic ferrimagnetic Curie temperatures (TC) coupled to monotonic composition-controlled magnetization. Its origin remains an important long-standing puzzle in the absence of studies probing their temperature-dependent element-specific magnetism. Here, in order to resolve this issue and identify design principles for new R-M-M’ permanent magnets, we carry out x-ray magnetic circular dichroism (XMCD) for the series Gd6(Mn1−xFex)23, x = 0.0 − 0.75. The results show that the net Mn-moment reduces and switches from parallel to antiparallel for x ≥ 0.2, while the Fe-moment is always antiparallel to the Gd-moment. Kouvel-Fisher analyses of XMCD data reveals distinct sublattice TC’s and 3D Heisenberg criticality. Band structure calculations show magnetic moments and density of states consistent with experiments. The magnetic phase diagram shows three regions characterized by (i) Mn-sublattice bulk-TC > Gd-sublattice TC, (ii) a reduced common-TC for all sublattices, and (iii) Fe-sublattice bulk-TC > Gd-sublattice TC. The Mn-moment switching and gradual increase of Fe-moment combine to cause non-monotonic TC’s with monotonic magnetization. The study indicates the importance of element-specific TC’s for tuning magnetic properties.

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ER -

Element-specific Curie temperatures and Heisenberg criticality in ferrimagnetic Gd₆(Mn_1−xFe_x)₂₃ via Kouvel-Fisher analysis

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