Magnetic properties of Zn doped Co{sub 2}Y hexaferrite by using high-field Mössbauer spectroscopy

Journal Article · Wed May 07 00:00:00 EDT 2014 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.4865879· OSTI ID:22273799

Tae Lim, Jung

The polycrystalline samples of Ba{sub 2}Co{sub 2−x}Zn{sub x}Fe{sub 12}O{sub 22} (x = 0.5, 1.0, 1.5) were synthesized by using solid-state-reaction method. From the XRD patterns, analyzed by Rietveld refinement, the prepared samples are found to be single-phased with rhombohedral structure (R-3m). The magnetic properties of samples were investigated with vibrating sample magnetometer, and high-field Mössbauer spectrometer. From the zero-field-cooled curves under 100 Oe between 4.2 and 740 K, we observe that the samples show spin transition from helicalmagnetic to ferrimagnetic order. With increasing Zn ion concentration, the spin transition temperature (T{sub s}) and Curie temperature (T{sub C}) decrease linearly. We have obtained Zero-field Mössbauer spectra of all samples at various temperatures ranging from 4.2 to 650 K, and analyzed the spectra below T{sub C} as six-sextets for Fe sites. From the temperature dependence of hyperfine field (H{sub hf}), we have noticed an abrupt change in H{sub hf} at T{sub s}. In addition, Mössbauer spectra of all samples at 4.2 K were taken with applied field ranging from 0 to 50 kOe, indicating the canting angle between applied field and H{sub hf} decreased with increasing Zn concentration.

• OSTI ID: 22273799
• Journal Information: Journal of Applied Physics, Vol. 115, Issue 17; Conference: 55. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 14-18 Nov 2010; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ABSORPTION SPECTRA
ABSORPTION SPECTROSCOPY
COBALT COMPOUNDS
CONCENTRATION RATIO
CURIE POINT
DOPED MATERIALS
FERRITES
MAGNETIC PROPERTIES
POLYCRYSTALS
SOLIDS
SPIN
TEMPERATURE DEPENDENCE
TRIGONAL LATTICES
VIBRATING SAMPLE MAGNETOMETERS
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
ZINC IONS