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Magnetic properties of Fe<inf>2</inf>P-type Tb<inf>6</inf>FeTe<inf>2</inf>, Tb<inf>6</inf>CoTe<inf>2</inf>, Tb<inf>6</inf>NiTe<inf>2</inf> and Er <inf>6</inf>FeTe<inf>2</inf> compounds
Date Issued
01-12-2010
Author(s)
Morozkin, A. V.
Mozharivskyj, Yu
Svitlyk, V.
Indian Institute of Technology, Madras
Nigam, A. K.
Abstract
The magnetic ordering of the Fe2P-type Tb6FeTe 2, Tb6CoTe2 Tb6NiTe2 and Er6FeTe2 phases (space group P6̄2m) has been investigated through magnetization measurement and neutron powder diffraction. Tb6FeTe2, Tb6CoTe2 and Tb 6NiTe2 demonstrate high-temperature ferromagnetic and low-temperature spin reorientation transitions, whereas Er6FeTe 2 shows antiferromagnetic transition, only. The Tb 6FeTe2 and Tb6NiTe2 phases show same high-temperature collinear ferromagnetic structure, whereas Tb 6FeTe2 is the commensurate non-collinear ferromagnet and Tb6NiTe2 is the canted ferromagnetic cone with K 1=[0, 0, ±3/10] and K2=[±2/9, ±2/9, 0] wave vectors at 2 K. The magnetic structure of Er6FeTe2 is a flat spiral with K1=[0, 0, ±1/10] at 2 K. The magnetic entropy change for Tb6NiTe2 is ΔSm=-4.86 J/kg K at 229 K for the field change Δμ0H=05 T. In addition, novel Fe2P-type Gd6FeTe2, Zr 6FeTe2, Hf6FeTe2, Dy 6NiTe2, Zr6NiTe2 and Hf 6NiTe2 phases have been obtained. © 2010 Elsevier Inc. All rights reserved.
Volume
183