Moessbauer study on barium ferrite magnetic recording media and iron-based thin films
Moessbauer spectroscopy and magnetic measurements (VSM) are employed to study pure and Co-Ti substituted barium ferrite and iron-based thin films. For substituted barium ferrite, the Moessbauer spectra are superposition of five subspectra because of the five different environments of the Fe[sup 3+] ions. The author observes that spectral peak width broadens as Co-Ti substitution increases, eventually leading to very poor resolution. In this work, a series of Co-Ti substituted barium ferrite samples have been studied at room temperature in an applied field only up to 0.8 T with transmission geometry Moessbauer spectroscopy. A difference in applied-field spectra compared with zero-field spectra is observed. A computer program for generating applied Moessbauer spectra for powdered ferrimagnetic samples [11] has been implemented. Assuming a 2-sublattice structure, and comparing the simulated and experimental spectra, the author obtains a value of the anisotropy field for pure barium ferrite at room temperature of 0.35 [+-] 0.05 T. Conversion electron Moessbauer spectrometry has been used to study two series of Fe films sputtered at high and low argon pressures with variable thickness of 50 to 1000 nm. The relative intensities of the (2,5) components of the Zeeman sextet decrease with increasing film thickness for samples deposited at high argon pressure. In contrast, films deposited for samples deposited at high argon pressure. In contrast, films deposited at low argon pressure exhibit only a small decrease in (2,5) intensities over the thickness range studied, suggesting that moments retain in-plane orientation. The analysis shows that CEMS is a sensitive tool to investigate magnetic moment orientation in thin films and can supply useful information on the perpendicular anisotropy K[perpendicular] of thin films which can not be obtained by VSM or torque measurements.
- Research Organization:
- Alabama Univ., Birmingham, AL (United States)
- OSTI ID:
- 7168665
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM COMPOUNDS
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
FERRITES
ANISOTROPY
FERRIMAGNETIC MATERIALS
LINE BROADENING
MAGNETIC MOMENTS
RECORDING SYSTEMS
SPECTRA
ALKALINE EARTH METAL COMPOUNDS
IRON COMPOUNDS
MAGNETIC MATERIALS
MATERIALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
665000 - Physics of Condensed Matter- (1992-)