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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2014.6
- 수록면
- 111 - 115 (5page)
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초록· 키워드
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X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM) were used to investigate the influence of Ni ions on the structural, electronic, and magnetic properties of nickelferrites (NixFe<SUB>3-x</SUB>O₄). Spinel NixFe<SUB>3-</SUB>xO₄ (x ≤ 0.96) samples were prepared as polycrystalline thin films on Al₂O₃ (0001) substrates, using a sol-gel method. XRD patterns of the nickel-ferrites indicate that as the Ni composition increases (x > 0.3), a structural phase transition takes place from cubic to tetragonal lattice. The XPS results imply that the Ni ions in NixFe<SUB>3-</SUB>xO₄ substitute for the octahedral sites of the spinel lattice, mostly with the ionic valence of +2. The minority-spin d-electrons of the Ni<SUP>2+</SUP> ions are mainly distributed below the Fermi level (E<SUB>F</SUB>), at around 3 eV; while those of the Fe<SUP>2+</SUP> ions are distributed closer to E<SUB>F</SUB> (~1 eV below E<SUB>F</SUB><SUB></SUB>). The magnetic hysteresis curves of the NixFe<SUB>3-</SUB>xO₄ films measured by VSM show that as x increases, the saturation magnetization (M<SUB>s</SUB>) linearly decreases. The decreasing trend is primarily attributable to the decrease in net spin magnetic moment, by the Ni<SUP>2+</SUP> (2 μB) substitution for octahedral Fe<SUP>2+</SUP> (4 μB) site.
목차
1. Introduction
2. Experimental Details
3. Results and Discussion
4. Conclusions
References
참고문헌 (15)
참고문헌 신청
1. [단행본] - A. Goldman / 2006 / Modern Ferrite Technology / Springer
2. [학술지(정기간행물)] - S. B. Ogale / 1998 / / Phys. Rev. B 57 : 7823 ~
3. [학술지(정기간행물)] - 김광주 / 2014 / Effects of Tetrahedral Fe2+ on the Structural, Magnetic and Electronic Properties of Solution-based Titanomagnetite Thin Films / Journal of the Korean Physical Society 64 (1) : 93 ~ 97
4. [학술지(정기간행물)] - Y. S. Dedkov / 2002 / / Phys. Rev. B 65 : 064417 ~
5. [학술지(정기간행물)] - W. Wang / 2006 / / Phys. Rev. B 73 : 134412 ~
2. [학술지(정기간행물)] - S. B. Ogale / 1998 / / Phys. Rev. B 57 : 7823 ~
3. [학술지(정기간행물)] - 김광주 / 2014 / Effects of Tetrahedral Fe2+ on the Structural, Magnetic and Electronic Properties of Solution-based Titanomagnetite Thin Films / Journal of the Korean Physical Society 64 (1) : 93 ~ 97
4. [학술지(정기간행물)] - Y. S. Dedkov / 2002 / / Phys. Rev. B 65 : 064417 ~
5. [학술지(정기간행물)] - W. Wang / 2006 / / Phys. Rev. B 73 : 134412 ~
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UCI(KEPA) : I410-ECN-0101-2015-420-001709596