STRUCTURE AND MAGNETIC PROPERTIES OF NITRIDES R3Fe29-xCrxN4
HAN XIU-FENG (韩秀峰)a, ZAN YU-DE (昝玉德)a, WANG QI-YUAN (王启元)a, WANG JUN (王俊)a, YANG FU-MING (杨伏明)b, MA LONG (马龙)b
a Material Science Center, Institute of Semiconductors, Academia Sinica , Beijing 100083, China; b State Key Laboratory for Magnetism, Institute of Physics, Academia Sinica, Beijing 100080, China
Abstract A systematic investigation of nitrides R3Fe29-xCrxN4(R=Y, Ce, Nd, Sm, Gd, Tb, and Dy) has been performed. The nitrogen concentration in the nitride R3Fe29-xCrxNy was determined to be y=4. Nitrogenation leads to a relative volume expansion of about 5.3%. The lattice constants and unit cell volume decrease with in creasing rare earth atomic number from Nd to Dy, reflecting the lanthanide contraction. In average, the increase of Curie temperature upon nitrogenation is about 200 K, compared with its parent compound. The nitrogenation also results in a remarkable improvement in the saturation magnetization and anisotropy fields for R3Fe29-xCrxN4 at 4.2 K and room temperature, comp ared with their parent compounds. A spin reorientation of Nd3Fe24.5 Cr4.5N4 occurs at around 368 K, which is 138 K higher than that of Nd3Fe24.5Cr4.5. Magnetohistory effects of R3Fe29-xCrxN4(R=Nd and Sm) are observed in a low field of 0.04 T. First order magneti zation process occurs in Sm3Fe24.0Cr5.0N4 in magnetic fields of around 3.0 T at 4.2 K. After nitrogenation the easy magnetization direction of Sm3Fe24.0Cr5.0 is changed from the easy cone structure to the uniaxial. The excellent intrinsic magnetic properties of Sm3Fe24.0Cr5.0N4 make this compound a hopeful candidate for new high performance permanent magnets.
Received: 28 May 1997
Accepted manuscript online:
PACS:
75.60.Ej
(Magnetization curves, hysteresis, Barkhausen and related effects)
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the National Natural Science Foundation of China.
Cite this article:
HAN XIU-FENG (韩秀峰), ZAN YU-DE (昝玉德), WANG QI-YUAN (王启元), WANG JUN (王俊), YANG FU-MING (杨伏明), MA LONG (马龙) STRUCTURE AND MAGNETIC PROPERTIES OF NITRIDES R3Fe29-xCrxN4 1998 Acta Physica Sinica (Overseas Edition) 7 38
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