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Structural and Magnetic Ordering in Fe-Ga Thin Films Examined by Mössbauer Spectrometry

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Szumiata T., Brzózka K., Gawroński M., Górka B., Javed A., Morley N., Gibbs M.

Acta Physica Polonica A

2011

vol. 119

issue 1

21-23

The detailed analysis of atomic and magnetic structure has been performed by Mössbauer spectroscopy for polycrystalline Fe_{80}Ga_{20} films of different thickness ranging from 20 nm to 200 nm. The films were deposited on Si(100) substrate using dual sputtering and evaporation method. Obtained CEMS spectra have been fitted with several Gaussian distributions of hyperfine magnetic field. The results point to the domination of BCC disordered A2 phase and the absence of DO_{3} and L1_{2} phases in the films. Both hyperfine parameters and lattice constant reveal anomaly for 40 nm thick sample - presumably due to the change of the internal stress. Spin texture evolves from in-plane to out-of-the-plane configuration with increasing thickness.

Magnetism and Structure Evolution in Ni-Zn Ferrites Thin Films - CEMS Study

84%

Szumiata T., Gzik-Szumiata M., Brzózka K., Górka B., Gawroński M., Javed A., Farman K., Fatima T.

Acta Physica Polonica A

2017

vol. 131

issue 4

836-838

In this work, a ⁵⁷Fe conversion electron Mössbauer spectrometry and X-ray diffraction have been utilized in order to investigate the structural and magnetic order in 500 nm thick Ni-Zn ferrite films deposited on Si(100) substrate by laser ablation. Considering the contributions of the conversion electron Mössbauer subspectra corresponding to the tetrahedral (A) and octahedral (B) sites, the spinel inversion parameter in [Zn_{x}Fe_{1-x}]^{A}[Ni_{1-x}Fe_{1+x}]^{B}O₄ films has been estimated. The hyperfine field (B_{hf}) values in the investigated Ni-Zn ferrites thin films are about 5-8% smaller than those of bulk ferrites, which could be a sign of thermal magnetic relaxations due to the size effects. The distribution of hyperfine magnetic field directions was found to be affected by perpendicular anisotropy.

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2 Acta Physica Polonica A

1 2017

1 2011

2 Brzózka K.

2 Gawroński M.

2 Górka B.

2 Javed A.

2 Szumiata T.

1 Farman K.

1 Fatima T.

1 Gibbs M.

1 Gzik-Szumiata M.

1 Morley N.

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Structural and Magnetic Ordering in Fe-Ga Thin Films Examined by Mössbauer Spectrometry

Magnetism and Structure Evolution in Ni-Zn Ferrites Thin Films - CEMS Study