Magnetic entropy change and accurate determination of Curie temperature in single-crystalline helimagnet FeGe

Cubic helimagnet FeGe has emerged as a class of skyrmion materials near room temperature that may impact future information technology. Experimentally identifying the detailed properties of skyrmion materials enables their practical application acceleratedly. Here we study the magnetic entropy chang...

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Bibliographic Details
Published in:Europhysics letters 2017-02, Vol.117 (4), p.47004-47004
Main Authors: Xu, Lisha, Han, Hui, Fan, Jiyu, Shi, Daning, Hu, Dazhi, Du, Haifeng, Zhang, Lei, Zhang, Yuheng, Yang, Hao
Format: Article
Language:English
Subjects:
75.30.Kz
75.30.Sg
75.70.Kw
Curie temperature
Electrons
Entropy
Exponents
Hypothetical particles
Magnetic materials
Magnetic properties
Magnetic structure
Particle theory
Phase diagrams
Phase transformations
Phase transitions
Precursors
Room temperature
Single crystals
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Summary:Cubic helimagnet FeGe has emerged as a class of skyrmion materials near room temperature that may impact future information technology. Experimentally identifying the detailed properties of skyrmion materials enables their practical application acceleratedly. Here we study the magnetic entropy change (MEC) of single-crystalline FeGe in its precursor region and clarify its close relation to the critical exponents of a second-order phase transition in this area. The maximum MEC is found to be 2.86 J/kg · K for a 7.0 T magnetic-field change smaller than that of common magnetocaloric materials indicating the multiplicity and complexity of the magnetic structure phases in the precursor region. This result also implies that the competition among the multimagnetic phases can partly counteract the magnetic-field-driven force and establishes a stable balance. Based on the obtained MEC and the critical exponents, the exact Curie temperature of single-crystalline FeGe under zero magnetic field is confirmed to be 279.1 K, higher than the previously reported 278.2 K. This finding paves the way for reconstruction of the FeGe phase diagram in the precursor region.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/117/47004