Extremely large magnetic entropy change of MnAs1-xSbx near room temperature

Hirofumi Wada; Kentaro Taniguchi; Yuji Tanabe

doi:10.2320/matertrans.43.73

Extremely large magnetic entropy change of MnAs_1-xSb_x near room temperature

Hirofumi Wada, Kentaro Taniguchi, Yuji Tanabe

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

90 Citations (Scopus)

Abstract

Magnetization of MnAs_1-xSb_x was measured as functions of temperature and magnetic field for 0 ≤ x ≤ 0.4. The entropy change caused by a magnetic field, ΔS_mag, was estimated on the basis of the Maxwell relation. The ΔS_mag for 0 ≤ x ≤ 0.3 in a field change of 5T reaches 25-30 J/K kg, which exceeds that of other materials by a factor of 2-4. The substitution of Sb for As can tune the Curie temperature between 230 K and 315 K without any significant reduction of ΔS_mag. The large ΔS_mag originates in a paramagnetic ferromagnetic transition induced by a magnetic field. These results indicate that MnAs_1-xSb_x is a promising material for a working substance in magne refrigeration near room temperature.

Original language	English
Pages (from-to)	73-77
Number of pages	5
Journal	Materials Transactions
Volume	43
Issue number	1
DOIs	https://doi.org/10.2320/matertrans.43.73
Publication status	Published - Jan 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.2320/matertrans.43.73

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abstract = "Magnetization of MnAs1-xSbx was measured as functions of temperature and magnetic field for 0 ≤ x ≤ 0.4. The entropy change caused by a magnetic field, ΔSmag, was estimated on the basis of the Maxwell relation. The ΔSmag for 0 ≤ x ≤ 0.3 in a field change of 5T reaches 25-30 J/K kg, which exceeds that of other materials by a factor of 2-4. The substitution of Sb for As can tune the Curie temperature between 230 K and 315 K without any significant reduction of ΔSmag. The large ΔSmag originates in a paramagnetic ferromagnetic transition induced by a magnetic field. These results indicate that MnAs1-xSbx is a promising material for a working substance in magne refrigeration near room temperature.",

author = "Hirofumi Wada and Kentaro Taniguchi and Yuji Tanabe",

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AU - Wada, Hirofumi

AU - Taniguchi, Kentaro

AU - Tanabe, Yuji

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N2 - Magnetization of MnAs1-xSbx was measured as functions of temperature and magnetic field for 0 ≤ x ≤ 0.4. The entropy change caused by a magnetic field, ΔSmag, was estimated on the basis of the Maxwell relation. The ΔSmag for 0 ≤ x ≤ 0.3 in a field change of 5T reaches 25-30 J/K kg, which exceeds that of other materials by a factor of 2-4. The substitution of Sb for As can tune the Curie temperature between 230 K and 315 K without any significant reduction of ΔSmag. The large ΔSmag originates in a paramagnetic ferromagnetic transition induced by a magnetic field. These results indicate that MnAs1-xSbx is a promising material for a working substance in magne refrigeration near room temperature.

AB - Magnetization of MnAs1-xSbx was measured as functions of temperature and magnetic field for 0 ≤ x ≤ 0.4. The entropy change caused by a magnetic field, ΔSmag, was estimated on the basis of the Maxwell relation. The ΔSmag for 0 ≤ x ≤ 0.3 in a field change of 5T reaches 25-30 J/K kg, which exceeds that of other materials by a factor of 2-4. The substitution of Sb for As can tune the Curie temperature between 230 K and 315 K without any significant reduction of ΔSmag. The large ΔSmag originates in a paramagnetic ferromagnetic transition induced by a magnetic field. These results indicate that MnAs1-xSbx is a promising material for a working substance in magne refrigeration near room temperature.

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Extremely large magnetic entropy change of MnAs_1-xSb_x near room temperature

Abstract

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