X-ray Magnetic Circular Dichroism Study of Ce<sub>0.5</sub>Gd<sub>0.5</sub>Ni

Okane, Tetsuo; Takeda, Yukiharu; Yano, Kazuo; Fujimori, A.; Yamagami, Hiroshi; Nishimura, K.; Isikawa, Yosikazu; Satō, Kiyoo

doi:10.7566/jpscp.3.011028

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…1d. Their spectral shape is very similar to earlier XMCD results of Gd intermetallics like GdFe, GdNi, and GdCo 42,[45][46][47][48][49] . The values of spin and orbital magnetic moments (µ spin , µ orb ) of Gd from the measured intensities of XAS and XMCD spectra was determined by a sum rule analysis as detailed in Supplementary Note 2.…”

Section: Xas and Xmcd Resultssupporting

confidence: 86%

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

Nguyen,

Mazet,

Gaudry

et al. 2024

Commun Mater

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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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Section: Xas and Xmcd Resultssupporting

confidence: 86%

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

Nguyen,

Mazet,

Gaudry

et al. 2024

Commun Mater

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Electronic states and exchange interaction behaviors in crystal mixed system of (Ce 1−X Gd X )Ni (0≤ X≤0.8) through magnetic properties

Yano

Ohta

Satō

2017

Journal of Physics and Chemistry of Solids

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Electronic structure investigation of GdNi using x-ray absorption, magnetic circular dichroism, and hard x-ray photoemission spectroscopy

et al. 2020

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GdNi is a ferrimagnetic material with a Curie temperature TC = 69 K which exhibits a large magnetocaloric effect, making it useful for magnetic refrigerator applications. We investigate the electronic structure of GdNi by carrying out x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) at T = 25 K in the ferrimagnetic phase. We analyze the Gd M4,5-edge (3d -4f ) and Ni L2,3-edge (2p -3d) spectra using atomic multiplet and cluster model calculations, respectively. The atomic multiplet calculation for Gd M4,5-edge XAS indicates that Gd is trivalent in GdNi, consistent with localized 4f states. On the other hand, a model cluster calculation for Ni L2,3-edge XAS shows that Ni is effectively divalent in GdNi and strongly hybridized with nearest neighbour Gd states, resulting in a d-electron count of 8.57. The Gd M4,5-edge XMCD spectrum is consistent with a ground state configuration of S = 7/2 and L=0. The Ni L2,3-edge XMCD results indicate that the antiferromagnetically aligned Ni moments exhibit a small but finite total magnetic moment ( mtot ∼ 0.12 µB ) with the ratio mo/ms ∼ 0.11. Valence band hard x-ray photoemission spectroscopy shows Ni 3d features at the Fermi level, confirming a partially filled 3d band, while the Gd 4f states are at high binding energies away from the Fermi level. The results indicate that the Ni 3d band is not fully occupied and contradicts the charge-transfer model for rare-earth based alloys. The obtained electronic parameters indicate that GdNi is a strongly correlated charge transfer metal with the Ni on-site Coulomb energy being much larger than the effective charge-transfer energy between the Ni 3d and Gd 4f states.

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X-ray Magnetic Circular Dichroism Study of Ce_0.5Gd_0.5Ni

Cited by 3 publications

References 15 publications

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

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

Electronic states and exchange interaction behaviors in crystal mixed system of (Ce 1−X Gd X )Ni (0≤ X≤0.8) through magnetic properties

Electronic structure investigation of GdNi using x-ray absorption, magnetic circular dichroism, and hard x-ray photoemission spectroscopy

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X-ray Magnetic Circular Dichroism Study of Ce0.5Gd0.5Ni

Cited by 3 publications

References 15 publications

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

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

Electronic states and exchange interaction behaviors in crystal mixed system of (Ce 1−X Gd X )Ni (0≤ X≤0.8) through magnetic properties

Electronic structure investigation of GdNi using x-ray absorption, magnetic circular dichroism, and hard x-ray photoemission spectroscopy

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X-ray Magnetic Circular Dichroism Study of Ce_0.5Gd_0.5Ni