Critical Behavior of the Magnetization in Heusler Alloy CoTiGa.Sn.

Takaaki Yokoyama; Iduru Shigeta; Akiko Nomura; Kunio Yubuta; Touru Yamauchi; Rie Y. Umetsu; Hironori Nishihara; Takeshi Kanomata; Masahiko Hiroi

doi:10.1109/TMAG.2021.3097164

Critical Behavior of the Magnetization in Heusler Alloy CoTiGa.Sn.

Takaaki Yokoyama, Iduru Shigeta, Akiko Nomura, Kunio Yubuta, Touru Yamauchi, Rie Y. Umetsu, Hironori Nishihara, Takeshi Kanomata, Masahiko Hiroi

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

Abstract

We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2 as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2 are investigated around the Curie temperature TC. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2 around TC exhibit that the critical exponent Δ is deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Both Δ values are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed.

Original language	English
Journal	IEEE Transactions on Magnetics
Volume	58
Issue number	2
DOIs	https://doi.org/10.1109/TMAG.2021.3097164
Publication status	Published - Feb 1 2022
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2021.3097164

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title = "Critical Behavior of the Magnetization in Heusler Alloy CoTiGa.Sn.",

abstract = "We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2 as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2 are investigated around the Curie temperature TC. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2 around TC exhibit that the critical exponent Δ is deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Both Δ values are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed. ",

author = "Takaaki Yokoyama and Iduru Shigeta and Akiko Nomura and Kunio Yubuta and Touru Yamauchi and Umetsu, {Rie Y.} and Hironori Nishihara and Takeshi Kanomata and Masahiko Hiroi",

note = "Publisher Copyright: {\textcopyright} 1965-2012 IEEE.",

year = "2022",

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doi = "10.1109/TMAG.2021.3097164",

language = "English",

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T1 - Critical Behavior of the Magnetization in Heusler Alloy CoTiGa.Sn.

AU - Yokoyama, Takaaki

AU - Shigeta, Iduru

AU - Nomura, Akiko

AU - Yubuta, Kunio

AU - Yamauchi, Touru

AU - Umetsu, Rie Y.

AU - Nishihara, Hironori

AU - Kanomata, Takeshi

AU - Hiroi, Masahiko

PY - 2022/2/1

Y1 - 2022/2/1

N2 - We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2 as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2 are investigated around the Curie temperature TC. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2 around TC exhibit that the critical exponent Δ is deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Both Δ values are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed.

AB - We report the critical behavior of the magnetization in Heusler alloy Co2TiGa0.8Sn0.2 as a potential candidate of high spin-polarized materials with the characteristics of topological Weyl fermions. The Weyl semimetals are materials of great interest for applying spintronics devices, due to their unusual magnetoelectronic and magnetothermal properties. The magnetic properties of the synthesized Heusler alloy Co2TiGa0.8Sn0.2 are investigated around the Curie temperature TC. The magnetic isotherm measurements of Co2TiGa0.8Sn0.2 around TC exhibit that the critical exponent Δ is deduced to be 4.455(4) in high maximum applied field of 50 kOe and 4.823(9) in low maximum applied field of 10 kOe, respectively. Both Δ values are different from 3.0 derived by the conventional molecular field theory, but they are close to 5.0 predicted by the spin fluctuation theory for the itinerant electron ferromagnets. Possible origins for the discrepancy between experimental results and theoretical models are also discussed.

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Critical Behavior of the Magnetization in Heusler Alloy CoTiGa.Sn.

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