Mechanism of grain-boundary magnetoresistance in Fe O films

Ziese, M.; Höhne, R.; Semmelhack, H.‐C.; Reckentin, H.; Hong, Nguyen Hoa; Esquinazi, P.

doi:10.1140/epjb/e2002-00245-3

Cited by 66 publications

(70 citation statements)

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“…2 , where θ is the angle between the magnetization directions of the nanoparticles [29,30]. In contrary, for the 60 nm diameter nanowires (figure 7), we did not observe a magnetoresistance at room temperature and only a small magnetoresistance at 77 K (around 0.2%).…”

Section: Magnetotransport Propertiesmentioning

confidence: 75%

Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires

Abid

Abid²,

Serrano-Guisan³

et al. 2006

J. Phys.: Condens. Matter

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We have studied the magnetic behaviour of Fe 3 O 4 nanowires (NWs) with two different diameter ranges, above 150 nm and below 60 nm, made by electrodeposition techniques into a polymeric template. The nanowires were characterized using various techniques, in particular Mössbauer and thermoelectrical power measurements. The stoichiometric distribution of Fe cations showed clearly the presence of the magnetite inverse spinel electronic structure. Structural analysis performed using high-resolution transmission electron microscopy revealed two kinds of nanowire morphologies depending on the size. For nanowires above 150 nm in diameter, a contiguous network of well-bound nanoparticles was obtained. Instead, with a diameter of 60 nm, a polycrystalline structure was observed. The largest nanowires presented a magnetoresistance (MR) greater than 10%, whereas the thinner nanowires had almost none.

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Section: Magnetotransport Propertiesmentioning

confidence: 75%

Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires

Abid

Abid²,

Serrano-Guisan³

et al. 2006

J. Phys.: Condens. Matter

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“…7 Moreover, the Curie temperature of this ferrimagnetic oxide is quite high (858 K), 8 and it has a magnetic saturation moment of 4 l B . 9 MgO(001) is an ideal substrate to grow magnetite films with high crystalline quality.…”

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confidence: 99%

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Schemme

Krampf

Bertram³

et al. 2015

Journal of Applied Physics

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Iron oxide films were reactively grown on iron buffer films, which were deposited before on MgO(001) substrates to analyze the influence of the initial iron buffer layers on the magnetic properties of the magnetite films. X-ray photoelectron spectroscopy and low energy electron diffraction showed that magnetite films of high crystalline quality in the surface near region were formed by this two-step deposition procedure. The underlying iron film, however, was completely oxidized as proved by x-ray reflectometry and diffraction. The structural bulk quality of the iron oxide film is poor compared to magnetite films directly grown on MgO(001). Although the iron film was completely oxidized, we found drastically modified magnetic properties for these films using the magnetooptic Kerr effect. The magnetite films had strongly increased coercive fields, and their magnetic in-plane anisotropy is in-plane rotated by 458 compared to magnetite films formed directly by one step reactive growth on MgO(001). V C 2015 AIP Publishing LLC.

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“…This can only be due to Co-diffusion from the Co-ferrite spacer layer preferably into the bottom electrode layer [14,15]. Since this is a priori not unexpected, we have never observed this before in our work on Fe 3 O 4 /Co 0.16 Fe 2.84 O 4 bilayers [16]. Obviously the diffusion rate in the present case is considerably larger due to the high Co-concentration in the CoFe 2 O 4 layer.…”

Section: Resultsmentioning

confidence: 59%

Magnetic and Magnetotransport Properties οf Magnetite/Co-Ferrite/Magnetite Trilayers

Chen

Ziese

2009

Acta Phys. Pol. A

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The magnetic and magnetotransport properties of Fe 3 O 4 /CoFe 2 O 4 /Fe 3 O 4 trilayers were investigated. The magnetization measurements indicate significant Co diffusion into the bottom magnetite layer. At lower temperatures the magnetoresistance measurements show two clearly separated maxima due to contributions from magnetically hard and soft layers. A tunneling effect was not observed. Comparison of full and minor resistance hysteresis loops did not reveal any significant exchange coupling between the layers, presumably due to diffuse interfaces.

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Mechanism of grain-boundary magnetoresistance in Fe O films

Cited by 66 publications

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Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires

Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Magnetic and Magnetotransport Properties οf Magnetite/Co-Ferrite/Magnetite Trilayers

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Mechanism of grain-boundary magnetoresistance in Fe O films

Cited by 66 publications

References 0 publications

Magnetotransport properties depending on the nanostructure of Fe3O4nanowires

Magnetotransport properties depending on the nanostructure of Fe3O4nanowires

Modifying magnetic properties of ultra-thin magnetite films by growth on Fe pre-covered MgO(001)

Magnetic and Magnetotransport Properties οf Magnetite/Co-Ferrite/Magnetite Trilayers

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Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires

Magnetotransport properties depending on the nanostructure of Fe₃O₄nanowires