Nonlinear spin wave magnetization of solution synthesized Ni nanoparticles

Vitta, Satish

doi:10.1063/1.2710437

Cited by 16 publications

(7 citation statements)

References 27 publications

(21 reference statements)

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“…The lattice constant has been determined from all three XRD peaks and for each sample separately. The average of 0.3529 ¡ 0.0005 nm is consistent with the literature, namely 0.3524 nm for bulk Ni 35,36 being expanded up to 0.354 nm in small size, strained grains. 36 The intensity ratio of the (111) to the (200) peak heights increases from 2.32 (cyan curve) to 3.13 (green curve) when the morphology of nanostructures changes from particle to wire, indicating a preferential orientation of Ni grains in the wires.…”

Section: Size Control and Microstructuresupporting

confidence: 90%

Diameter-controlled synthesis of polycrystalline nickel nanowires and their size dependent magnetic properties

et al. 2012

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Polycrystalline nickel nanowires (NWs) with a length reaching tens of micrometers were prepared in large quantities by a facile and rapid microwave-assisted polyol method. Characterization by X-ray diffraction and electron microscopy reveal that the NWs are uniform with a narrow size distribution. Their diameters (D) are controllable in a wide range via the concentration of precursor solutions. The diameters of the NWs as well as those of the contained grains increase surprisingly linearly with the concentration. The NWs have rough surfaces at low concentrations but become smoother at high ones. The growth mechanisms leading to the grain and wire diameters and the surface morphology are discussed. The coercivity (H C ) decreases with increasing diameter whereas the saturation magnetization increases to approach the bulk value, indicating a strong size dependence of the magnetic properties. Owing to the anisotropic shape and collective grain interactions, these Ni NWs exhibit enhanced H C . At 70 nm, H C reaches as high as 382 Oe at 5 K, which is more than two orders of magnitude higher than that of bulk Ni (0.7 Oe) and exceeds even that of NWs synthesized with strong magnetic fields. Temperature dependent magnetization shows a wide separation between the field-cooled and zero-field-cooled M(T) curves due to the strong nanowire shape anisotropy.

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Section: Size Control and Microstructuresupporting

confidence: 90%

Diameter-controlled synthesis of polycrystalline nickel nanowires and their size dependent magnetic properties

et al. 2012

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“…This drop is likely associated with the onset of discontinuities in the film resulting in an increased surface contribution with high spin disorder and consequently reduced spin-wave stiffness. This has been observed in clusters of Ni nanoparticles [30]. In Fig.…”

Section: Experiments and Resultsmentioning

confidence: 66%

Enhanced electron-magnon scattering in ferromagnetic thin films and the breakdown of the Mott two-current model

2014

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Electron-magnon spin-flip scattering in thin films was studied by investigating the thickness dependence of the anisotropic magnetoresistance (AMR) effect and spin-wave stiffness. The absolute resistivity change due to the AMR effect ( ρ) in Ni, Ni:V, and Ni:Cr doped films reduced with film thickness. This loss of AMR is due to enhanced spin-flip scattering, dropping at the same thickness irrespective of dopant. The spin-wave stiffness reduced at the same thickness, confirming enhanced electron-magnon spin-flip scattering. The AMR ratio was fitted with a simple model, in which thickness dependence was included in a spin mixing resistivity term. This analysis gives insight into the fundamental contribution of magnon scattering to the resistivity in thin films, which ultimately has relevance to spin coherence in spintronic devices.

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“…All dimensions are given in nm. significantly reduced saturation magnetization [44,45,46,47,48]. This e↵ect is usually associated with strong magnetic disorder and spin-glass like behaviour at the nanoparticle surface [49,50,51,52].…”

Section: A Phenomenological Model For the Macroscopic Structure Of Thmentioning

confidence: 99%

The role of mesoscopic structuring on the intermixing of spin-polarised conduction channels in thin-film ferromagnets for spintronics

Alcer

Atkinson²

2017

Nanotechnology

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The separation of spin-up and spin-down conduction channels is fundamental to electronic transport in ferromagnets and essential for spintronic functionality. The spin states available for conduction are defined by the ferromagnetic material, but additional physical factors can affect scattering and modify the spin-dependence of conduction. Here the effect of mesoscopic structuring, arising during the growth of ferromagnetic thin films, on the electronic transport was investigated. Resistivity and anisotropic magnetoresistance were measured in a series of NiFe thin films as a function of nominal film thickness from [Formula: see text] up to [Formula: see text]. The observed thickness dependence of the resisivity and magnetic anisotropy of resistivity are interpreted using a model that accounts for the macroscopic structuring from the growth of the films and incorporates a structural dependence of the spin-flip scattering. The model shows good agreement for both the thickness dependence of the resistivity and the reduction of the anisotropic magnetoresistivity. The latter indicating that increasing mixing of the conducting spin channels occurs in ultra-thin films, mainly a consequence of macroscopic structuring of the films.

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Nonlinear spin wave magnetization of solution synthesized Ni nanoparticles

Cited by 16 publications

References 27 publications

Diameter-controlled synthesis of polycrystalline nickel nanowires and their size dependent magnetic properties

Diameter-controlled synthesis of polycrystalline nickel nanowires and their size dependent magnetic properties

Enhanced electron-magnon scattering in ferromagnetic thin films and the breakdown of the Mott two-current model

The role of mesoscopic structuring on the intermixing of spin-polarised conduction channels in thin-film ferromagnets for spintronics

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