Composition effect in ferromagnetic properties of Tb3Co3Ga

Kitagawa, Jiro; Terada, Hirotaka; Shirakawa, Naoki; Tsubota, Masami; Nose, Akira; Tanaka, Seiya

doi:10.1016/j.rinp.2019.102591

Cited by 5 publications

(5 citation statements)

References 19 publications

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“…For example, the T C of Tb 2 Co 2 Ga ranges rather widely from 75 to 145 K by changing the starting composition [121]. Such a composition effect is reported in other compounds [122][123][124] such as Nd 3 Pd 20 Ge 6 , Tb 3 Co 3 Ga and Mn 1+x Ga. In many cases, the crystal structure parameters slightly change, which heavily affects the magnetic exchange interactions.…”

Section: Towards Further On-demand Control Of Magnetismmentioning

confidence: 79%

Interstitial Atom Engineering in Magnetic Materials

Kitagawa

Sakaguchi

Hara

et al. 2020

Metals

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Interstitial light elements play an important role in magnetic materials by improving the magnetic properties through changes of the unit cell volume or through orbital hybridization between the magnetic and interstitial atoms. In this review focusing on the effects of interstitial atoms in Mn-based compounds, which are not well researched, the studies of interstitial atoms in three kinds of magnetic materials (rare-earth Fe-, Mn-, and rare-earth-based compounds) are surveyed. The prominent features of Mn-based compounds are interstitial-atom-induced changes or additional formation of magnetism—either a change from antiferromagnetism (paramagnetism) to ferromagnetism or an additional formation of ferromagnetism. It is noted that in some cases, ferromagnetic coupling can be abruptly caused by a small number of interstitial atoms, which has been overlooked in previous research on rare-earth Fe-based compounds. We also present candidates of Mn compounds, which enable changes of the magnetic state. The Mn-based compounds are particularly important for the easy fabrication of highly functional magnetic devices, as they allow on-demand control of magnetism without causing a large lattice mismatch, among other advantages.

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Section: Towards Further On-demand Control Of Magnetismmentioning

confidence: 79%

Interstitial Atom Engineering in Magnetic Materials

Kitagawa

Sakaguchi

Hara

et al. 2020

Metals

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“…Especially for the latter temperature, it may be important to investigate a possible long-range ordering. χ ac (T) is a useful tool for this because the real part of χ ac (T) can often distinguish respective magnetic ordering as a peak, even in the case that a large χ dc anomaly due to a strong magnetic interaction masks a small anomaly by a minor magnetic ordering [28,29]. The inset of Figure 5a presents the real part of ac magnetization χ ac (T) between 3 K and 300 K, showing no anomaly except for the broad peak due to the spin-glass transition.…”

Section: Resultsmentioning

confidence: 99%

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

et al. 2021

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High-entropy alloys (HEAs) are broadly explored from the perspective of mechanical, corrosion-resistance, catalytic, structural, superconducting, magnetic properties, and so on. In magnetic HEAs, 3d transition metals or rare-earth elements are well-studied compositional elements. We researched a magnetic HEA containing Fe combined with 4d and 5d transition metals, which has not been well investigated, and found a new dual-phase face-centered-cubic (fcc) HEA FeRhIrPdPt. The structural, magnetic, and transport properties were evaluated by assuming that FeRhIrPdPt is a mixture of FeRh4, FeIr4, FePd4, and FePt4, all with the fcc structure. The dual-phase is composed of a Rh- and Ir-rich main phase and a Pd- and Pt-rich minor one. FeRh4 and FeIr4 show spin freezings at low temperatures, while FePd4 and FePt4 are ferromagnetic. Two magnetic features can characterize FeRhIrPdPt. One is the canonical spin-glass transition at 90 K, and the other is a ferromagnetic correlation that appears below 300 K. The main and minor phases were responsible for the spin-glass transition and the ferromagnetic correlation below 300 K, respectively.

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“…In the inset of Figure 6a, the χ ac (T) of the sample with the starting composition Tb 42.9 Co 50 Ga 7.1 is exhibited. This sample contains the pseudo binary TbCo 2-x Ga x alloy and the N phase [6]. Two pronounced peaks are observed at approximately 250 and 60 K, for which the pseudo binary TbCo 2−x Ga x alloy and the N phase are responsible, respectively [6].…”

Section: Xrd Pattern and Microstructurementioning

confidence: 99%

“…This sample contains the pseudo binary TbCo 2-x Ga x alloy and the N phase [6]. Two pronounced peaks are observed at approximately 250 and 60 K, for which the pseudo binary TbCo 2−x Ga x alloy and the N phase are responsible, respectively [6]. The x value of TbCo 2−x Ga x is estimated to be 0.22, corresponding to that of TbCo 2−x Ga x exhibiting ferromagnetic transitions at approximately 260 K [12].…”

Section: Xrd Pattern and Microstructurementioning

confidence: 99%

“…Several ferromagnetic compounds of R 2 Co 2 Al and R 2 Co 2 Ga (R = heavy rare earth) with an orthorhombic W 2 CoB 2 (Mo 2 NiB 2 ) -type structure [1] are attractive as magnetic refrigeration materials [2][3][4][5]. Recently, we studied the orthorhombic W 3 CoB 3 -type Tb 3 Co 3 Ga that is located near Tb 2 Co 2 Ga in the ternary phase diagram [6]. A polycrystalline Tb 3 Co 3 Ga sample also showed ferromagnetism, but the Curie temperature T C ranged from 90 K to 117 K, depending on the starting atomic composition.…”

Section: Introductionmentioning

confidence: 99%

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The Impact of the Composition Effect on Ferromagnetic Properties of Tb2Co2Ga

Tanaka

Terada

Shirakawa

et al. 2019

Metals

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The ferromagnetic properties of Tb2Co2Ga, crystallizing into an orthorhombic W2CoB2-type structure, were investigated by preparing 11 polycrystalline samples with different starting atomic compositions. We found that Tb2Co2Ga possesses a homogeneity range in the ternary phase diagram. The Curie temperature TC is sensitive to the atomic composition and ranges rather widely, i.e., from 75 to 145 K. For the samples with a TC above 90 K, the nearest Tb–Tb and the Tb–Co distances would be important factors deciding TC, considering the RKKY interaction through the hybridization between Tb and Co atoms. An anisotropic change of two kinds of Co–Tb–Co angles in the octahedron formed by two Tb and four Co atoms occurs in the samples with a TC lower than 90 K. Such a change of octahedral parameters seems to be related to a difference of shapes in the ac magnetization anomaly at TC between the samples in the lowest TC (~ 75 K) group and those in the other groups.

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Composition effect in ferromagnetic properties of Tb3Co3Ga

Cited by 5 publications

References 19 publications

Interstitial Atom Engineering in Magnetic Materials

Interstitial Atom Engineering in Magnetic Materials

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt

The Impact of the Composition Effect on Ferromagnetic Properties of Tb2Co2Ga

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