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The Magnetocaloric Composite Designed by Multi‐Gd‐Al‐Co Microwires with Close Performances

Journal Article · · Physica Status Solidi. A, Applications and Materials Science
 [1];  [2];  [2];  [2];  [3];  [2];  [2];  [2];  [4];  [2];  [5]
  1. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 P. R. China, Department of Physics University of South Florida Tampa, Florida 33620 USA
  2. School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 P. R. China
  3. School of Materials Science and Engineering Inner Mongolia University of Technology No. 49 Aimin Street Hohhot 010051 P. R. China
  4. Department of physics Qiqihar University Qiqihar 161006 P. R. China
  5. Department of Physics University of South Florida Tampa, Florida 33620 USA

A new magnetocaloric composite composed of three types of soft ferromagnetic Gd‐based microwires with equal mass ratio and close magnetocaloric performances is designed. The Curie temperatures ( T C ) of these three wires are ≈97, ≈100, and ≈101 K, respectively. However, the magnetization versus temperature curve of the composite sample shows almost a single ferromagnetic–paramagnetic transition at ≈97 K. For a field change of µ 0 Δ H  = 5 T, the maximum entropy change () and refrigerant capacity (RC) of this composite are calculated to be ≈9.98 J kg −1  K −1 and ≈665 J kg −1 , respectively. There is a good agreement between the calculated −Δ S M ( T ) curve and the experimental data, indicating weak magnetic interactions among different wire compositions. Additionally, the calculated universal master curves of the composite and its Gd‐Al‐Co components are fitted very well, which reveals the second‐order type of the magnetic transition for the composite. The designed composite integrates all magnetocaloric properties of its components, suggesting that the Gd‐based amorphous wires with close magnetocaloric properties can be designed as an excellent refrigerant for use in active magnetic refrigerators.

Sponsoring Organization:
USDOE
Grant/Contract Number:
FG02-07ER46438
OSTI ID:
1512823
Alternate ID(s):
OSTI ID: 1609894
OSTI ID: 22871305
Journal Information:
Physica Status Solidi. A, Applications and Materials Science, Journal Name: Physica Status Solidi. A, Applications and Materials Science Journal Issue: 16 Vol. 216; ISSN 1862-6300
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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