The Experts below are selected from a list of 80883 Experts worldwide ranked by ideXlab platform
V Korenivski - One of the best experts on this subject based on the ideXlab platform.
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ghz Magnetic film inductors
Journal of Magnetism and Magnetic Materials, 2000Co-Authors: V KorenivskiAbstract:Use of Magnetic Films for miniaturization of planar inductors operating at ultra-high frequencies is reviewed. Materials and design aspects determining the efficiency of the devices are analyzed. Mechanisms involved in Magnetic dissipation and their role in limiting the device operation frequency range and quality factor are discussed. Typical inductor geometries are considered. A Magnetically sandwiched strip inductor is argued to hold a promise for GHz applications.
Lloyd C. l. Hollenberg - One of the best experts on this subject based on the ideXlab platform.
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Magneto-optical imaging of thin Magnetic Films using spins in diamond
Scientific Reports, 2016Co-Authors: David A. Simpson, Jean Philippe Tetienne, Julia M. Mccoey, Liam T. Hall, Steven Petrou, Robert E. Scholten, Kumaravelu Ganesan, Lloyd C. l. HollenbergAbstract:Imaging the fields of Magnetic materials provides crucial insight into the physical and chemical processes surrounding magnetism, and has been a key ingredient in the spectacular development of Magnetic data storage. Existing approaches using the magneto-optic Kerr effect, x-ray and electron microscopy have limitations that constrain further development, and there is increasing demand for imaging and characterisation of Magnetic phenomena in real time with high spatial resolution. Here we show how the magneto-optical response of an array of negatively-charged nitrogen-vacancy spins in diamond can be used to image and map the sub-micron stray Magnetic field patterns from thin ferroMagnetic Films. Using optically detected Magnetic resonance, we demonstrate wide-field Magnetic imaging over 100 x 100 mum(2) with sub-micron spatial resolution at video frame rates, under ambient conditions. We demonstrate an all-optical spin relaxation contrast imaging approach which can image Magnetic structures in the absence of an applied microwave field. Straightforward extensions promise imaging with sub-muT sensitivity and sub-optical spatial and millisecond temporal resolution. This work establishes practical diamond-based wide-field microscopy for rapid high-sensitivity characterisation and imaging of Magnetic samples, with the capability for investigating Magnetic phenomena such as domain wall and skyrmion dynamics and the spin Hall effect in metals.
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magneto optical imaging of thin Magnetic Films using spins in diamond
arXiv: Mesoscale and Nanoscale Physics, 2015Co-Authors: David A. Simpson, Jean Philippe Tetienne, Julia M. Mccoey, Liam T. Hall, Steven Petrou, Robert E. Scholten, Kumaravelu Ganesan, Lloyd C. l. HollenbergAbstract:Imaging the fields of Magnetic materials provides crucial insight into the physical and chemical processes surrounding magnetism, and has been a key ingredient in the spectacular development of Magnetic data storage. Existing approaches using the magneto-optic Kerr effect (MOKE), x-ray and electron microscopy have limitations that constrain further development, and there is increasing demand for imaging and characterisation of Magnetic phenomena in real time with high spatial resolution. In this work, we show how the magneto-optical response of an array of negatively-charged nitrogen-vacancy spins in diamond can be used to image and map the sub-micron stray Magnetic field patterns from thin ferroMagnetic Films. Using optically detected Magnetic resonance, we demonstrate wide-field Magnetic imaging over 100x100 {\mu}m^2 with a diffraction-limited spatial resolution of 440 nm at video frame rates, under ambient conditions. We demonstrate a novel all-optical spin relaxation contrast imaging approach which can image Magnetic structures in the absence of an applied microwave field. Straightforward extensions promise imaging with sub-{\mu}T sensitivity and sub-optical spatial and millisecond temporal resolution. This work establishes practical diamond-based wide-field microscopy for rapid high-sensitivity characterisation and imaging of Magnetic samples, with the capability for investigating Magnetic phenomena such as domain wall and skyrmion dynamics and the spin Hall effect in metals.
Toshitaka Fujii - One of the best experts on this subject based on the ideXlab platform.
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the wall coercivity of soft Magnetic Films
Journal of Magnetism and Magnetic Materials, 1993Co-Authors: H Hoffmann, Toshitaka FujiiAbstract:Abstract The coercivity of soft Magnetic Films was intensively investigated some decades ago. Recently the coercive force in soft Magnetic materials has been discussed again. In the present discussions the previous theoretical and experimental results are usually neglected. In this paper it is demonstrated that in polycrystalline uniaxial soft Magnetic Films the wall coercive force is expressed as H W α S √ D 4 √ K u / M S , where S is the ripple parameter, D the mean diameter of the crystal lites, and K u the uniaxial anisotropy constant.
Khalil Zakeri - One of the best experts on this subject based on the ideXlab platform.
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probing of the interfacial heisenberg and dzyaloshinskii moriya exchange interaction by magnon spectroscopy
arXiv: Strongly Correlated Electrons, 2017Co-Authors: Khalil ZakeriAbstract:This Topical Review presents an overview of the recent experimental results on the quantitative determination of the Magnetic exchange parameters in ultrathin Magnetic Films and multilayers, grown on different substrates. The experimental approaches to probe both the symmetric Heisenberg as well as the antisymmetric Dzyaloshinskii--Moriya exchange interaction in ultrathin Magnetic Films and at interfaces are discussed in detail. It is explained how the experimental spectrum of Magnetic excitations can be used to quantify the strength of these interactions.
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probing of the interfacial heisenberg and dzyaloshinskii moriya exchange interaction by magnon spectroscopy
Journal of Physics: Condensed Matter, 2017Co-Authors: Khalil ZakeriAbstract:: This Topical Review presents an overview of the recent experimental results on the quantitative determination of the Magnetic exchange parameters in ultrathin Magnetic Films and multilayers grown on different substrates. The experimental approaches for probing both the symmetric Heisenberg and the antisymmetric Dzyaloshinskii-Moriya exchange interaction in ultrathin Magnetic Films and at interfaces are discussed in detail. It is explained how the experimental spectrum of Magnetic excitations can be used to quantify the strength of these interactions.
J A C Bland - One of the best experts on this subject based on the ideXlab platform.
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polarized neutron reflection as a probe of Magnetic Films and multilayers
Physical Review B, 1992Co-Authors: Stephen J Blundell, J A C BlandAbstract:The application of polarized neutron reflection (PNR) to the study of the Magnetic properties of thin Films and multilayers is described. It is demonstrated that PNR provides a means of directly determining the magnetization-vector profile in multilayers of known layer thickness and layer density. Thus, the magnetization reversal process in these systems can be directly studied. A matrix method is presented which can be used to calculate the spin-dependent reflectivity from a multilayer with general in-plane orientation of the Magnetic moment in each layer. In addition, we show that behavior of the spin asymmetry is dominated by multiple reflections and refraction just above the critical wave vector, but with increasing wave vector, such processes become progressively less important, and the response moves towards a ``diffraction limit'' in which a Fourier-transform approximation to the exact result can be used. The ideas in this paper are illustrated by a number of examples, including the exchange-biased structure Ag/Fe-Ni/Cu/Fe-Ni/Fe-Mn/Si.
