Magnetic response of cobalt nanowires with diameter below 5 nm

Schio, P.; Vidal, Franck; Zheng, Y.; Milano, J.; Fonda, Emiliano; Demaille, Dominique; Vodungbo, Boris; Varalda, J.; Oliveira, A. J. A. de; Etgens, V. H.

doi:10.1103/physrevb.82.094436

Cited by 40 publications

(41 citation statements)

References 30 publications

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“…This was not seen in our previous work on STF [16], but there have been several other observations of metallic transition metal nanorods forming in an oxide matrix, notably Fe in a (nonperovskite) LaSrFeO 4 matrix formed from the deposition of LaSr 0.5 Fe 0.5 O 3 , and Co, Ni, or Fe in ceria or STO by codeposition of the matrix phase with a transition metal oxide [77][78][79]. In the P ¼ 4 μTorr STF/STO, it is possible that the low base pressure combined with the large tetragonal distortion due to epitaxy promotes the precipitation of a fraction of the Fe as a strain relief mechanism that is not seen in the nonepitaxial films on Si.…”

Section: F Discussionmentioning

confidence: 54%

Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

et al. 2017

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Both polycrystalline and single-crystal films of iron-substituted strontium titanate, SrðTi 0.65 Fe 0.35 ÞO 3−δ , prepared by pulsed laser deposition, show room-temperature magnetism and Faraday rotation, with the polycrystalline films exhibiting higher saturation magnetization and Faraday rotation. The magnetic properties vary with the oxygen pressure at which the films are grown, showing a maximum at pressures of approximately 4 μ Torr at which the unit-cell volume is largest. The results are discussed in terms of the oxygen stoichiometry and corresponding Fe valence states, the structure and strain state, and the presence of small-volume fractions of metallic Fe in single-crystal films grown at the optimum deposition pressure. Integration of magneto-optical polycrystalline films on an optical-waveguide device demonstrates a nonreciprocal phase shift.

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Section: F Discussionmentioning

confidence: 54%

Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

et al. 2017

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“…53 The RTFM may arise due to spin coupled from a nearest-neighbor interaction by double exchange (Ce -O-Ce 3+ ) mechanism by charge transfer transition between O 2p and Ce 4f energy bands. 54 Ge et al 25 has reported that the oxygen vacancies are responsible for the generation of magnetic moment by polarizing spins of f electrons of cerium (Ce) ions located around the oxygen vacancies, which results ferromagnetism in pure CeO 2 samples.…”

Section: +mentioning

confidence: 99%

Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

et al. 2015

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In the present study, monodispersed CeO2 nanoparticles (NPs) of size 8.5 ± 1.0, 11.4 ± 1.0 and 15.4 ± 1.0 nm were synthesized using the sol-gel method. Size-dependent structural, optical and magnetic properties of as-prepared samples were investigated by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HR-TEM), ultra-violet visible (UV-VIS) spectroscopy, Raman spectroscopy and vibrating sample magnetometer (VSM) measurements. The value of optical band gap is calculated for each particle size. The decrease in the value of optical band gap with increase of particle size may be attributed to the quantum confinement, which causes to produce localized states created by the oxygen vacancies due to the conversion of Ce4+ into Ce3+ at higher calcination temperature. The Raman spectra showed a peak at ∼461 cm-1 for the particle size 8.5 nm, which is attributed to the 1LO phonon mode. The shift in the Raman peak could be due to lattice strain developed due to variation in particle size. Weak ferromagnetism at room temperature is observed for each particle size. The values of saturation magnetization (Ms), coercivity (Hc) and retentivity (Mr) are increased with increase of particle size. The increase of Ms and Mr for larger particle size may be explained by increase of density of oxygen vacancies at higher calcination temperature. The latter causes high concentrations of Ce3+ ions activate more coupling between the individual magnetic moments of the Ce ions, leading to an increase of Ms value with the particle size. Moreover, the oxygen vacancies may also produce magnetic moment by polarizing spins of f electrons of cerium (Ce) ions located around oxygen vacancies, which causes ferromagnetism in pure CeO2 samples.

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“…One dimensional (1D) magnetic structures such as nanowires, nanostripes, and atomic chains are of great importance due to their potential applications in the area of spintronics and as a test ground to investigate 1D magnetism [1][2][3]. The formation of such nanostructures can be either lithography based processes (top-down approach) or self-assembly based (bottom up approach).…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the strong dependence of the reversal processes on the geometry (width, length, thickness, interwire separation etc. ), associated length scales, and material characteristics calls for further studies in this area [1][2][3]. Only a few reports have focused on magnetization reversal in planar NW arrays *Address correspondence to this author at the CRANN and School of Physics, Trinity College Dublin, Dublin-2, Republic of Ireland; Tel: +353-1-8963031; Fax: +353-1-8963037; E-mail: aroras@tcd.ie defined lithographically [17].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Reversal Behaviour of Planar Nanowire Arrays of Fe

Arora

O'Dowd²,

Thakur³

et al. 2013

CNANO

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Systematic investigations of magnetization behavior performed on planar arrays of 30 nm wide Fe-nanowires (NW) fabricated on oxidized step-bunched Si (111) templates reveal that the NW arrays exhibit an uniaxial anisotropy dominated by the shape of the wires, that facilitates in retaining the magnetization in-plane with easy axis parallel to the wires. The NWs possess polycrystalline character with bcc-crystal structure, and present an oxidized interface when capped with MgO. From the temperature dependent magnetization studies we find that for thick wires (>4.5 nm) the magnetization reversal is governed by the curling reversal mode. Whereas, for thin wires the reversal is dominated by thermal activation.

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Magnetic response of cobalt nanowires with diameter below 5 nm

Cited by 40 publications

References 30 publications

Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

Magnetism and Faraday Rotation in Oxygen-Deficient Polycrystalline and Single-Crystal Iron-Substituted Strontium Titanate

Controlled synthesis and magnetic properties of monodispersed ceria nanoparticles

Magnetization Reversal Behaviour of Planar Nanowire Arrays of Fe

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