Ni–Zn ferrite films with high permeability (μ′=∼30, μ″=∼30) at 1 GHz prepared at 90 °C

Matsushita, Nobuhiro; Chong, Chee Ping; Mizutani, Tomoko; Abe, Masanori

doi:10.1063/1.1453930

Cited by 59 publications

(31 citation statements)

References 5 publications

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“…However, a remarkable feature of the films is that the magnetic resonance is clearly observed in the frequency spectra of initial permeability and this behavior gives the films a high potential as thin film electromagnetic noise absorbers useful in highly integrated electronic circuits working in the GHz frequency range [4]. For this reason intensive investigations have been performed on the fabrication process and the film compositions to improve magnetic softness and high frequency features of these films [2,5,6]. But to date little effort was made to explain why initial permeability as high as a few tens is always observed for these films in spite of their semi-hard magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

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Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

Shimada

Matsushita

Abe

et al. 2004

Journal of Magnetism and Magnetic Materials

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Section: Introductionmentioning

confidence: 99%

“…Nickel-zinc ferrite films prepared by spin spray plating from an aqueous solution have been studied intensively [1][2][3][4][5][6][7]. Since the films exhibit semi-hard magnetic properties with coercivity of 20B100 Oe, it seemed in the past that they are of no use from the standpoint of high permeability films.…”

Section: Introductionmentioning

confidence: 99%

Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

Shimada

Matsushita

Abe

et al. 2004

Journal of Magnetism and Magnetic Materials

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“…Thus, our films are much more morphologically homogeneous than ferrite films obtained by the same method [10]. Additionally, the nickel ferrite films presumably possess a columnar morphology [11], undetectable by top view observation during the SEM experiments. The topographical features of the surface of the nickel ferrite films were investigated by AFM.…”

Section: Resultsmentioning

confidence: 86%

Magnetic characterization of nanocrystalline nickel ferrite films processed by a spin-spraying method

Caruntu¹,

Dumitru²,

Caruntu³

et al. 2005

J. Phys. D: Appl. Phys.

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Highly crystalline nickel ferrite films with different chemical compositions were processed via the spin-spraying method and their morphological, structural and magnetic properties were subsequently investigated. Regardless of the chemical composition, films with variable thicknesses are constructed by 200-400 nm spherical grains grown in the direction normal to the substrate surface. Magnetization measurements show that the spinel ferrite films present a hysteretic behaviour at room temperature with a randomly oriented in-plane easy axis and an anisotropy constant K 1 ≈ −2.5 × 10 4 erg cm −3 . Furthermore, the absence of an angular dependence of the coercivity for the in-plane measurement of magnetization coupled with the 'M'-shaped angular dependence of the out-of-plane measurement, indicates that the anisotropy of this film is predominantly crystalline shape anisotropy.

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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] .…”

mentioning

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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Ni–Zn ferrite films with high permeability (μ′=∼30, μ″=∼30) at 1 GHz prepared at 90 °C

Cited by 59 publications

References 5 publications

Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

Study on initial permeability of Ni–Zn ferrite films prepared by the spin spray method

Magnetic characterization of nanocrystalline nickel ferrite films processed by a spin-spraying 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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