Tuning martensitic transformation and magnetoresistance effect by low temperature annealing in Ni<sub>45</sub>Co<sub>5</sub>Mn<sub>36.6</sub>In<sub>13.4</sub> alloys
Chen, L; Hu, F X; Wang, J; Zhao, J L; Sun, J R; Shen, B G; Yin, J H; Pan, L Q; Chen, L; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Hu, F X; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Wang, J; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Zhao, J L; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Sun, J R; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Shen, B G; State Key Laboratory for Magnetism and Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China; Yin, J H; Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China; Pan, L Q; Department of Physics, University of Science and Technology Beijing, Beijing 100083, People's Republic of China
Журнал:
Journal of Physics D: Applied Physics
Дата:
2011-03-02
Аннотация:
We studied the influence of post-annealing on magnetic and transport properties in Ni<sub>45</sub>Co<sub>5</sub>Mn<sub>36.6</sub>In<sub>13.4</sub> alloys. Our results demonstrate that post-annealing at low temperatures, ⩽300 °C, can lead to a significant change in magnetic properties, martensitic temperature (T<sub>M</sub>) and magnetoresistance effect through structure relaxations and possible change in atomic order. It was found that T<sub>M</sub> shifts from 314 to 283 K but the strong metamagnetic behaviour is still retained when the sample is annealed at 300 °C for 3 h. Thereupon, a large magnetoresistance effect over an extended temperature range can be achieved through controlling the heat treatment conditions. Meanwhile, the thermal stability of the novel composition is also disclosed through the investigations on low temperature annealing effect.
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