High Relative Cooling Power in a Multiphase Magnetocaloric FeNiB Alloy

Varun Chaudhary; Raju V. Ramanujan

doi:10.1109/LMAG.2015.2449259

High Relative Cooling Power in a Multiphase Magnetocaloric FeNiB Alloy

Varun Chaudhary, Raju V. Ramanujan^*

^*Corresponding author for this work

Nanyang Technological University

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

21 Citations (Scopus)

Abstract

Low-cost magnetic cooling based on the magnetocaloric effect is an energy efficient, environmentally friendly, thermal management technology. However, inadequate temperature span is often a challenge in developing a magnetic cooling system. We report the novel use of multiphase materials to enhance the working temperature span (δ T_FWHM) of the magnetic entropy change and the relative cooling power of a FeNiB bulk alloy. The coexistence of bcc, fcc, and spinel phases results in large working temperature spans of 322.3 and 439.0K for magnetic field change of 1 and 5 T, respectively. δ T_FWHM for this multiphase (Fe₇₀Ni ₃₀)₈₉B₁₁ alloy is about 86 higher than the corresponding value for single-phase -(Fe₇₀Ni₃₀)₈₉B₁₁ alloy for Δ H = 1 T. These values are the largest for any bulk magnetocaloric material and even higher than most magnetocaloric nanoparticles. The relative cooling power is also higher than comparable materials, including the benchmark magnetocaloric material, gadolinium.

Original language	English
Article number	7132735
Journal	IEEE Magnetics Letters
Volume	6
DOIs	https://doi.org/10.1109/LMAG.2015.2449259
Publication status	Published - 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 IEEE.

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials

Keywords

Coupled phenomena
Iron alloy
Magnetocaloric effect
Relative cooling power

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10.1109/LMAG.2015.2449259

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title = "High Relative Cooling Power in a Multiphase Magnetocaloric FeNiB Alloy",

abstract = "Low-cost magnetic cooling based on the magnetocaloric effect is an energy efficient, environmentally friendly, thermal management technology. However, inadequate temperature span is often a challenge in developing a magnetic cooling system. We report the novel use of multiphase materials to enhance the working temperature span (δ TFWHM) of the magnetic entropy change and the relative cooling power of a FeNiB bulk alloy. The coexistence of bcc, fcc, and spinel phases results in large working temperature spans of 322.3 and 439.0K for magnetic field change of 1 and 5 T, respectively. δ TFWHM for this multiphase (Fe70Ni 30)89B11 alloy is about 86 higher than the corresponding value for single-phase -(Fe70Ni30)89B11 alloy for Δ H = 1 T. These values are the largest for any bulk magnetocaloric material and even higher than most magnetocaloric nanoparticles. The relative cooling power is also higher than comparable materials, including the benchmark magnetocaloric material, gadolinium.",

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AB - Low-cost magnetic cooling based on the magnetocaloric effect is an energy efficient, environmentally friendly, thermal management technology. However, inadequate temperature span is often a challenge in developing a magnetic cooling system. We report the novel use of multiphase materials to enhance the working temperature span (δ TFWHM) of the magnetic entropy change and the relative cooling power of a FeNiB bulk alloy. The coexistence of bcc, fcc, and spinel phases results in large working temperature spans of 322.3 and 439.0K for magnetic field change of 1 and 5 T, respectively. δ TFWHM for this multiphase (Fe70Ni 30)89B11 alloy is about 86 higher than the corresponding value for single-phase -(Fe70Ni30)89B11 alloy for Δ H = 1 T. These values are the largest for any bulk magnetocaloric material and even higher than most magnetocaloric nanoparticles. The relative cooling power is also higher than comparable materials, including the benchmark magnetocaloric material, gadolinium.

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High Relative Cooling Power in a Multiphase Magnetocaloric FeNiB Alloy

Abstract

Bibliographical note

ASJC Scopus Subject Areas

Keywords

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