Volume 83, Number 5, September 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||03 September 2008|
Visual evidence of the magnetic glass state and its re-crystallization in Gd5Ge4
Magnetic and Superconducting Materials Section, Raja Ramanna Centre for Advanced Technology Indore 452 013, India
2 Blackett Laboratory, Imperial College of Science Technology and Medicine - London SW7 2BZ, UK, EU
3 Ames Laboratory of the US DOE and Department of Materials Science and Engineering, Iowa State University Ames, IA 50011-3020, USA
Accepted: 24 July 2008
We present the results of scanning Hall probe microscopy experiments on polycrystalline Gd5Ge4 providing visual evidence of the formation of a ”magnetic-glass” out of a kinetically arrested first-order antiferromagnetic-to-ferromagnetic transition. This magnetic-glass state consists of equilibrium ferromagnetic microscopic regions distributed randomly in a metastable antiferromagnetic matrix. In addition we show how the introduction of energy fluctuations in the system produces spatially dependent signs of growth of ferromagnetic phase or re-crystallization of this 'magnetic-glass'.
PACS: 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.) / 64.70.P- – Glass transitions of specific systems / 75.10.Nr – Spin-glass and other random models
© EPLA, 2008
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