GREAT MAGNETIC ENTROPY CHANGE IN La(Fe, M)13 (M=Si, Al) WITH Co DOPING
Hu Feng-xia (胡凤霞)ab, Shen Bao-gen (沈保根)a, Sun Ji-rong (孙继荣)a, Zhang Xi-xiang (张西祥)c
a State Key Laboratory of Magnetism, Institute of Physics & Center of Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080, China; b Department of Physics, Capital Normal University, Beijing 100037, China; c Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
Abstract Very large magnetic entropy change $\Delta$SM, which originates from a fully reversible second-order transition at Curie temperature TC, has been discovered in compounds La(Fe, Si)13, La(Fe, Al)13 and those with Co doping. The maximum change $\Delta$SM $\approx$ 19 J·kg-1·K-1, achieved in LaFe11.4Si1.6 at 209K upon a 5T magnetic field change, exceedsthat of Gd by more than a factor of 2. The TC of the Co-doped compounds shifts to higher temperatures. $\Delta$SM still has a considerable large magnitude near room temperature. The phenomena of very large $\Delta$SM, convenience of adjustment of TC, and also thesuperiority of low cost, strongly suggest that the compounds La(Fe,M)13(M=Si, Al) with Co doping are suitable candidates for magnetic refrigerants at high temperatures.
(Magnetization curves, hysteresis, Barkhausen and related effects)
Fund: Project supported by the State Key Project of Fundamental Research (Grant No. G1998061305) and by the National Natural Science Foundation of China (Grant No. 59525101).
Cite this article:
Hu Feng-xia (胡凤霞), Shen Bao-gen (沈保根), Sun Ji-rong (孙继荣), Zhang Xi-xiang (张西祥) GREAT MAGNETIC ENTROPY CHANGE IN La(Fe, M)13 (M=Si, Al) WITH Co DOPING 2000 Chinese Physics 9 550
Altmetric calculates a score based on the online attention an article receives. Each coloured thread in the circle represents a different type of online attention. The number in the centre is the Altmetric score. Social media and mainstream news media are the main sources that calculate the score. Reference managers such as Mendeley are also tracked but do not contribute to the score. Older articles often score higher because they have had more time to get noticed. To account for this, Altmetric has included the context data for other articles of a similar age.
