Cation distribution in NiZn-ferrite films via extended x-ray absorption fine structure

Harris, V. G.; Koon, N. C.; Williams, C. M.; Zhang, Q.; Abe, Machiko; Kirkland, J. P.

doi:10.1063/1.115591

Cited by 92 publications

(60 citation statements)

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“…Zn substitution in our magnetite films grown in an Ar/O 2 mixture results in a decrease of resistivity in contrast to what is observed for the films grown in pure Ar atmosphere. On first sight, this is astonishing and seems to be in conflict with the above discussion, since Zn 2+ again preferably occupies the tetrahedrally coordinated A lattice sites 21 , substituting Fe 3+ and thereby reducing carrier density. That is, one would expect an increase of resistivity with increasing x.…”

Section: +contrasting

confidence: 40%

“…Most likely this can be attributed to the fact that suitable trivalent ions usually prefer the octahedral coordination on the B site and thus cannot be substituted solely on the tetrahedral A site. Second, as done in our work, Fe spinel structure 21 . Again some of the antiferromagnetically coupled moments on the A sites are removed, leading to an initial increase of the saturation magnetization at low Zn substitution 12,22 .…”

Section: +mentioning

confidence: 82%

“…With increasing x, as discussed in the introduction, Zn 2+ preferably occupies the tetrahedrally coordinated A site in the inverse spinel structure 21 . Hence, the substitution of Fe …”

Section: +mentioning

confidence: 99%

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EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

et al. 2009

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The ferrimagnetic spinel oxide ZnxFe3−xO4 combines high Curie temperature and spin polarization with tunable electrical and magnetic properties, making it a promising functional material for spintronic devices. We have grown epitaxial ZnxFe3−xO4 thin films (0 ≤ x ≤ 0.9) on MgO(001) substrates with excellent structural properties both in pure Ar atmosphere and an Ar/O2 mixture by laser molecular beam epitaxy and systematically studied their structural, magnetotransport and magnetic properties. We find that the electrical conductivity and the saturation magnetization can be tuned over a wide range (10 2 . . . 10 4 Ω −1 m −1 and 1.0 . . . 3.2 µB/f.u. at room temperature) by Zn substitution and/or finite oxygen partial pressure during growth. Our extensive characterization of the films provides a clear picture of the underlying physics of the spinel ferrimagnet ZnxFe3−xO4 with antiparallel Fe moments on the A and B sublattice: (i) Zn substitution removes both Fe 3+ A moments from the A sublattice and itinerant charge carriers from the B sublattice, (ii) growth in finite oxygen partial pressure generates Fe vacancies on the B sublattice also removing itinerant charge carriers, and (iii) application of both Zn substitution and excess oxygen results in a compensation effect as Zn substitution partially removes the Fe vacancies. Both electrical conduction and magnetism is determined by the density and hopping amplitude of the itinerant charge carriers on the B sublattice, providing electrical conduction and ferromagnetic double exchange between the mixed-valent Fe

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Section: +contrasting

confidence: 40%

Section: +mentioning

confidence: 82%

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EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

et al. 2009

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“…ion occupies partially B-site at low concentration of Zn 2? [4]. As a result, they exhibit higher saturation magnetization and Curie temperature.…”

Section: Introductionmentioning

confidence: 93%

Structural and magnetic properties of nickel–zinc ferrite nanocrystalline magnetic particles prepared by microwave combustion method

et al. 2014

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Magnetic, nano-crystalline samples of zinc substituted nickel ferrite, (Zn x Ni 1-x Fe 2 O 4 for x = 0.0-0.9 in step of 0.2), are synthesized using microwave combustion synthesis technique. The structural properties of Ni-Zn are determined using X-ray powder diffraction, transmission electron microscopy; Fourier transforms infrared spectroscopy and neutron diffraction techniques. Average crystalline size obtained from X-ray diffraction and neutron diffraction is in the range of 30-60 nm. The cation distribution obtained from X-ray diffraction and neutron diffraction show that Zn occupies only tetrahedral A-site in the spinel lattice. The values of magnetic moment derived from magnetization measurements and neutron diffraction agrees nearly 97 % to that of bulk at 300 K. This methodology can be used to prepare large quantities (about 10 g) of sample at one time using kitchen microwave oven working at 1,200 W power.

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“…Based on these improvements, spraying and the spin coating techniques, effective for preparing spinel ferrite films at low deposition temperature, has been obtained [9,11,12] . They have plated Fe 3 O 4 , CoFe 2 O 4 , Ni-Zn ferrite thin films of the spinel structure and Y 3 Fe 5 O 12 (YIG) of the garnet structure with these methods [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] . Recently, they have been focusing on the study of plated soft magnetic ferrite films having high natural resonance frequencies (f r ) offering promising use for the GHz band electromagnetic wave absorbers [21][22][23][24][25][26][27] .…”

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confidence: 99%

Structure and 57Fe conversion electron Mössbauer spectroscopy study of Mn-Zn ferrite nanocrystal thin films by electroless plating in aqueous solution

et al. 2008

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Mn 1-x Zn x Fe 2 O 4 thin films with various Zn contents and of different thickness were synthesized on glass substrates directly by electroless plating in aqueous solution at 90 without heat treatment. The Mn℃ -Zn ferrite films have a single spinel phase structure and well-crystallized columnar grains growing perpendicularly to the substrates. The results of conversion electron 57 Fe Mössbauer spectroscopy (CEMS) indicate that the cation distribution of Mn 1-x Zn x Fe 2 O 4 ferrite nanocrystal thin films fabricated by electroless plating is different from the bulk materials' and a great quantity of Fe 3+ ions are still present on A sites for x＞0.5. When the Zn content of the films increases, Fe 3+ ions in the films transfer from A sites to B sites and the hyperfine magnetic field reduces, suggesting that Zn 2+ has strong chemical affinity towards the A sites. On the other side, with the increase of the thickness of the films, Fe 3+ ions, at B sites in the spinel structure, increase and the array of magnetic moments no longer lies in the thin film plane completely. At x = 0.5, H c and M s of Mn 1-x Zn x Fe 2 O 4 thin films show a minimum of 3.7 kA/m and a maximum of 419.6 kA/m, respectively. Mn-Zn ferrite, thin films, CEMS, electroless platingIn recent years, as electronic devices have become more miniaturized, offering increasing high levels of performance, the study of electronic devices under much higher-signal frequencies has become a trend. Metal alloy, as a potential candidate, has limited applications because of their high conductivity and serious eddy currency loss at high frequencies. On the contrary, owing to their large resistivities, low power losses, and high permeabilities, ferrites have become very important in high frequency soft magnetic applications. Soft magnetical Mn-Zn or Ni-Zn ferrite thin films with high resistivity and ac permeability were pioneering in applications pertinent to micro-inductors and micro-transformers [1][2][3] . Thus many groups put their emphasis on studying magnetic properties and microstructure of Mn-Zn ferrite thin films recently [4][5][6][7] .Although Mn-Zn ferrite films have such good properties including high resistivity, good quality at high frequency, and good performance of soft magnetis, during their preparation there are many factors that are not easy to control. Mn-Zn ferrite is sensitive to its fabrication environment, especially at high annealing temperature. About 20 years ago [8][9][10] , Abe and his co-workers introduced a low-temperature (T<100 ) electroless plating ℃ technique in aqueous solution to prepare magnetic spinel thin films of high crystalline quality without direct heat treatment. They have also conducted a detailed and further research pertinent to technique mechanism as well as have been improving the technique constantly. Based on these improvements, spraying and the spin coating

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Cation distribution in NiZn-ferrite films via extended x-ray absorption fine structure

Cited by 92 publications

References 0 publications

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

EpitaxialZnxFe3−xO4thin films: A spintronic material with tunable electrical and magnetic properties

Structural and magnetic properties of nickel–zinc ferrite nanocrystalline magnetic particles prepared by microwave combustion method

Structure and 57Fe conversion electron Mössbauer spectroscopy study of Mn-Zn ferrite nanocrystal thin films by electroless plating in aqueous solution

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