Journal
JAPANESE JOURNAL OF APPLIED PHYSICS
Volume 49, Issue 1, Pages -Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.49.010211
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Funding
- National Key Project for Basic Research [2005CB623605]
- National Natural Science Foundation of China [50701022]
- China Postdoctoral Science Foundation [20070420995]
- Jiangsu Planned Projects for Postdoctoral Research Funds [0702017B]
- Natural Science Foundation of Jiangsu Educational Department [06KJA43014]
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The phase transitions, magnetocaloric effect and magnetoresistance in Ni43Mn46-xCoxSn11 (x = 0-5) ferromagnetic shape memory alloys were investigated. With the increase of Co concentration, the temperatures of martensitic transformation and magnetic transition in austenitic phase increase rapidly, while the magnetic transition temperature in martensitic phase shows a small decrease. In Ni43Mn41Co5Sn11, a giant magnetic entropy change of 19.1 J/(kg.K) in the magnetic field of 10 kOe at 294 K, as well as a large magnetoresistance of -59% for the field change of 50 kOe at 281 K, is observed. These interesting phenomena are associated with the sudden changes of magnetization and resistance near the martensitic transition temperature. These results make the low-cost Ni-Mn-Co-Sn have promising application in magnetic refrigeration and magnetic sensor. (C) 2010 The Japan Society of Applied Physics
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