Magnetic properties of the ferrimagnetic FeCr2-xMxS4 (M=In,Al)

作者：Kim Chin Mo; Kim Sam Jin; Son Bae Soon; Kim Chul Sung^*

来源：Journal of Applied Physics, 2010, 107(9): 09A501.

DOI：10.1063/1.3337662

The polycrystalline samples of ferrimagnetic FeCr2-xMxS4 (M=In,Al; x=0.1, 0.3) have been studied with x-ray diffraction, magnetization, and Mossbauer spectroscopy measurements. The crystal structure was found to be cubic spinel with Fd-3m space group. The lattice constants (a(0)) of the samples were linearly increased with Al and In concentration. Mossbauer spectra of FeCr2-xMxS4 (M=In,Al; x=0.1, 0.3) were obtained at various temperatures ranging from 4.2 to 300 K. Magnetic hyperfine field and electric quadrupole interactions for FeCr2-xMxS4 (M=In,Al; x=0.1) at 4.2 K have been fitted, yielding the following results: for M=Al, H-hf = 139 kOe, Delta E-Q=2.54 mm/s, theta=30 degrees, phi=0.0 degrees, eta=0.9, and R=2.7; and for M=In, H-hf=126 kOe, Delta E-Q=2.64 mm/s, theta=30 degrees, phi=0.0 degrees, eta=1.0, and R=3.1. The isomer shift (delta) value of the FeCr2-xMxS4 (x=0.1) samples for both M=Al and In at 300 K was 0.50 mm/s, relative to the Fe metal, which is consistent with the Fe2+ valence state. The Debye temperatures (Theta(D)) of the FeCr2-xAlxS4 (x=0.1,0.3) sample were determined to be 299 +/- 5 and 247 +/- 5 K, respectively, and those of the FeCr2-xInxS4 (x=0.1, 0.3) samples were determined to be 257 +/- 5 and 239 +/- 5 K, respectively.

• 出版日期2010-5-1