Open volume defects and magnetic phase transition in Fe{sub 60}Al{sub 40} transition metal aluminide

Magnetic phase transition in the Fe{sub 60}Al{sub 40} transition metal aluminide from the ferromagnetic disordered A2-phase to the paramagnetic ordered B2-phase as a function of annealing up to 1000 °C has been investigated by means of magneto-optical and spectroscopy techniques, i.e., Kerr effect,...

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Bibliographic Details
Published in:Journal of applied physics 2015-04, Vol.117 (16)
Main Authors: Liedke, M. O., Anwand, W., Butterling, M., Wagner, A., Bali, R., Cornelius, S., Potzger, K., Trinh, T. T., Technical University Dresden, Helmholtzstr. 10, 01609 Dresden, Salamon, S., Walecki, D., Smekhova, A., Wende, H.
Format: Article
Language:English
Subjects:
ABSORPTION SPECTROSCOPY
ALUMINIUM
ANNEALING
ANNIHILATION
CONCENTRATION RATIO
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
EVAPORATION
INTERMETALLIC COMPOUNDS
IRON
IRRADIATION
KERR EFFECT
MAGNETO-OPTICAL EFFECTS
MOESSBAUER EFFECT
PARAMAGNETISM
POSITRONS
TEMPERATURE DEPENDENCE
TRANSITION TEMPERATURE
VACANCIES
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Summary:Magnetic phase transition in the Fe{sub 60}Al{sub 40} transition metal aluminide from the ferromagnetic disordered A2-phase to the paramagnetic ordered B2-phase as a function of annealing up to 1000 °C has been investigated by means of magneto-optical and spectroscopy techniques, i.e., Kerr effect, positron annihilation, and Mössbauer spectroscopy. The positron annihilation spectroscopy has been performed in-situ sequentially after each annealing step at the Apparatus for In-situ Defect Analysis that is a unique tool combining positron annihilation spectroscopy with temperature treatment, material evaporation, ion irradiation, and sheet resistance measurement techniques. The overall goal was to investigate the importance of the open volume defects onto the magnetic phase transition. No evidence of variation in the vacancy concentration in matching the magnetic phase transition temperature range (400–600 °C) has been found, whereas higher temperatures showed an increase in the vacancy concentration.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4919014