Giant Magnetoresistance and Hall Effect in Fe-Based Metal-Oxide Granular Thin Films

誠司, 三谷; 康隆, 真谷; 繁弘, 大沼; 啓安, 藤森

doi:10.3379/jmsjmag.21.465

Cited by 39 publications

(25 citation statements)

References 14 publications

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“…4. The relative change of resistivity (Δρ/ρ = 2.1% at 77 K) is comparable with the value of 4.6% reported for the sputter-deposited film Fe 44 Hf20 O 36 [5]. As can be seen, the effect substantially decreases for room temperature in contradiction to the results of Hayakawa et al [2].…”

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confidence: 55%

Magnetic and Electric Transport Properties of Fe-Hf-o Films Prepared by Supersonic Plasma Jet Method

et al. 2000

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The influence of deposition conditions on the structure, magnetic properties, and electrical resistivity of Fe-Hf-O films, prepared by the supersonic plasma jet deposition technique, was investigated. Composition of the films was controlled by the nozzle composition and the working gas. It varied in the limits: 15-68 at.% of Fe, 0.5-8 at.% of Hf and 29-80 at.% of O. The films were mainly X-ray amorphous. Some of them showed a weak and broad peak near the [110] reflection of α-Fe indicating the presence of Fe-rich clusters in an amorphous matrix. Depending on the deposition parameters the magnetic properties vary from paramagnetic to ferromagnetic ones. The electrical resistivity changes from the metallic to the hopping type. 1n some samples a large negative magnetoresistance is observed.PACS numbers: 75.50.Kj, 75.70.Ρa Nanogranular composites, consisting of ferromagnetic metal grains in an insulating matrix, are under the growing interest due to their prominent magnetic and magnetoresistant properties. The nanogranular Fe-Hf-O films, prepared by the reactive magnetron sputtering, exhibit good soft magnetic properties together with high resistivity in the Fe-rich region [1] and the giant magnetoresistance behavior in the Fe-poor region [2].In this work the Fe-Hf-O films, prepared by the supersonic plasma jet method, were investigated. This method provides some advantages in comparison with the conventional reactive magnetron sputtering [3]. A simple scheme of the reactive plasma jet reactor is shown in Fig. 1. The material of the source is sputtered by the ions produced in the RF hollow cathode discharge. One RF electrode is formed by the nozzle connected to RF generator (27.12 MHz, 500 W). The hollow cathode discharge takes place at the nozzle mouth in the working gas (the mixture of Ar and H2) coming through the nozzle into the reactor chamber. The grounded wall of the chamber and the substrate holder are the second electrode. The atoms and ions sputtered from the inner wall of the nozzle are drifted towards the substrate by the working gas leaving the nozzle with supersonic velocity. The supersonic plasma forms a well defined channel with high chemical reactivity. The (515)

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Magnetic and Electric Transport Properties of Fe-Hf-o Films Prepared by Supersonic Plasma Jet Method

et al. 2000

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“…The TMR effects for Fe-Al-O and Fe-Si-O granular films prepared by rf sputtering methods have been investigated by Mitani et al [2] and Honda et al [3], respectively. The largest MR ratios measured at room temperature were 3.6%~4.0%.…”

Section: Introductionmentioning

confidence: 99%

CEMS and XPS studies on iron states in sputtered Fe‐Al‐O granular TMR films

Abuliemu

Wakabayashi

Matsuzawa

et al. 2004

phys. stat. sol. (c)

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PACS 73.90.+f, 75.75.+a, 76.80.+y, 82.80.Pv In order to glean the origin of the difference between TMR effects in sputtered Fe-Al-O granular films and Fe-implanted Al 2 O 3 granular film, the iron ionic states and the size distributions for α-Fe particles in sputtered Fe-Al-O granular TMR films were investigated using Conversion Electron Mössbauer Spectroscopy (CEMS) with and without applied magnetic field. From CEMS without magnetic field, the ferric iron phase (Fe 3+ ) in contrast to the superparamagnetic α-Fe particles and ferrous iron(Fe 2+ ) phases observed for the Fe-implanted samples, was found to appear in the sputtered films where TMR effect was noticeable. From CEMS applied with 0.4 T magnetic field, the size distribution of α-Fe superparamagnetic particles was found to be broaden around 4 nm and not separated into two groups as observed in the Fe-implanted Al 2 O 3 granular film. In addition XPS was used for depth profiling.

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“…[1]. One kind of interest materials to exhibit TMR is a granular film consisting of nanometer sized magnetic metal like Fe embedded in insulators which caused by spin dependent tunneling between magnetic granules [2].…”

Section: Introductionmentioning

confidence: 99%

Tunneling Magnetoresistance (TMR) on Fe-Al<sub>2</sub>O<sub>3</sub> Nano Granular Film Growth by Helicon Plasma Sputtering

Purwanto

2011

Atom Indo.

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Giant Magnetoresistance and Hall Effect in Fe-Based Metal-Oxide Granular Thin Films

Cited by 39 publications

References 14 publications

Magnetic and Electric Transport Properties of Fe-Hf-o Films Prepared by Supersonic Plasma Jet Method

Magnetic and Electric Transport Properties of Fe-Hf-o Films Prepared by Supersonic Plasma Jet Method

CEMS and XPS studies on iron states in sputtered Fe‐Al‐O granular TMR films

Tunneling Magnetoresistance (TMR) on Fe-Al<sub>2</sub>O<sub>3</sub> Nano Granular Film Growth by Helicon Plasma Sputtering

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