Structure and magnetic properties of low-temperature annealed Ni-Mn-Al alloys

作者：Kim Yongdeok; Lee Seung Jae; Han Won Bae; Kim Hee Soo; An Hyeun Hwan; Yoon Chong Seung^*

来源：Journal of Applied Physics, 2013, 113(17): 17B102.

DOI：10.1063/1.4795323

Off-stoichiometric Ni2Mn2-xAlx (x = 0.5-1.2) and Ni2+y(Mn1.3Al0.7)(1-y/2), (y = 0.04-0.12) alloys were prepared to locate the composition range which is likely to form the ferromagnetic ordered L2(1) phase through low-temperature thermal annealing. In the Ni2Mn2-xAlx (x = 0.5-1.2) series, the alloy partially transformed to the ferromagnetic phase in the narrow composition range of x = 0.8-1.1. For the Ni-enriched composition series, Ni2+y(Mn1.3Al0.7)(1-y/2), (y = 0.04-0.12), magnetic ordering was not observed and the magnetic susceptibility proportionally decreased with the Ni concentration. It was concluded that moving away from stoichiometric composition would likely increase the disordering of Mn and Al site occupation and is not conducive to achieving ferromagnetism in Ni2MnAl.

• 出版日期2013-5-7