Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
See detailMagie und Wunder. Elemente und Funktionen des Übernatürlichen in der epischen mittelhochdeutschen Literatur um 1200
Sieburg, Heinz UL

in Sieburg, Heinz; Voltmer, Rita; Weimann, Britta (Eds.) Hexenwissen. Zum Transfer von Magie- und Zauberei-Imaginationen in interdisziplinärer Perspektive (2017)

Detailed reference viewed: 152 (7 UL)
See detailMagnetic and free-layer properties of MgO/(Co)FeB/MgO structure: Dependence on CoFeB composition
Bersweiler, Mathias UL

Scientific Conference (2019, January 17)

Detailed reference viewed: 81 (6 UL)
Peer Reviewed
See detailMagnetic Control of the Chiroptical Plasmonic Surfaces
Zubritskaya, Irina; Maccaferri, Nicolò UL; Inchausti Ezeiza, Xabier et al

in Nano Letters (2018), 18(1), 302-307

A major challenge facing plasmon nanophotonics is the poor dynamic tunability. A functional nanophotonic element would feature the real-time sizable tunability of transmission, reflection of light's ... [more ▼]

A major challenge facing plasmon nanophotonics is the poor dynamic tunability. A functional nanophotonic element would feature the real-time sizable tunability of transmission, reflection of light's intensity or polarization over a broad range of wavelengths, and would be robust and easy to integrate. Several approaches have been explored so far including mechanical deformation, thermal, or refractive index effects, and all-optical switching. Here we devise an ultrathin chiroptical surface, built on two-dimensional nanoantennas, where the chiral light transmission is controlled by the externally applied magnetic field. The magnetic field-induced modulation of the far-field chiroptical response with this surface exceeds 100% in the visible and near-infrared spectral ranges, opening the route for nanometer-thin magnetoplasmonic light-modulating surfaces tuned in real time and featuring a broad spectral response. [less ▲]

Detailed reference viewed: 60 (4 UL)
Full Text
Peer Reviewed
See detailMagnetic correlations in polycrystalline Tb0.15Co0.85
Bersweiler, Mathias UL; Bender, Philipp Florian UL; Peral Alonso, Inmaculada UL et al

in Journal of Physics: D Applied Physics (2020), 53

Detailed reference viewed: 61 (6 UL)
Full Text
Peer Reviewed
See detailMagnetic domains and annealing-induced magnetic anisotropy in nanocrystalline soft magnetic materials
Suzuki, K.; Ito, N.; Saranu, S. et al

in Journal of Applied Physics (2008), 103(7), 7301-7303

The magnetic domains of nanocrystalline Fe84Nb6B10 annealed under static and rotating magnetic fields have been investigated by means of magneto-optical Kerr effect (MOKE) microscopy in order to clarify ... [more ▼]

The magnetic domains of nanocrystalline Fe84Nb6B10 annealed under static and rotating magnetic fields have been investigated by means of magneto-optical Kerr effect (MOKE) microscopy in order to clarify the origin of the dramatic magnetic softening brought about by rotating field annealing. The coercivity (Hc) values after static- and rotating-magnetic field annealings are 5.9 and 3.0  A/m, respectively. The MOKE image after static field annealing implies a highly coherent uniaxial anisotropy (Ku) in the sample whereas no sign of such a strong Ku is evident in the domain configuration after rotating field annealing. Our analytical solution of the random anisotropy model with additional Ku predicts that the fluctuating amplitude of the effective anisotropy (δK) in nanocrystalline Fe84Nb6B10 decreases from 20 to 11 J/m3 by removing Ku. The observed reduction of Hc may be attributed to this decrease in δK induced by rotating field annealing. [less ▲]

Detailed reference viewed: 156 (4 UL)
Full Text
Peer Reviewed
See detailMagnetic field and gradient standards using permanent magnets: Design considerations, construction and validation by nuclear magnetic resonance
Perigo, Elio Alberto UL; Martin, Ramon Valls

in IEEE Transactions on Magnetics (2013), 49(8), 4717-4720

The construction and characterization of static magnetic density flux and gradient standards by using permanent magnets is presented. In the first case, the field homogeneity is high enough to be measured ... [more ▼]

The construction and characterization of static magnetic density flux and gradient standards by using permanent magnets is presented. In the first case, the field homogeneity is high enough to be measured by a nuclear magnetic resonance magnetometer, confirming the traceability of the standard. In the second case, a gradient standard is shown. The experimental results obtained by Hall probes are in agreement with theoretical calculations. Designing considerations about materials choice and mounting are also addressed. [less ▲]

Detailed reference viewed: 84 (5 UL)
Full Text
Peer Reviewed
See detailMagnetic field-dependent spin structures of nanocrystalline holmium
Szary, Philipp; Kaiser, Daniel UL; Bick, Jens-Peter et al

in Journal of Applied Crystallography (2016), 49

Detailed reference viewed: 106 (2 UL)
Full Text
Peer Reviewed
See detailMagnetic Guinier law
Michels, Andreas UL; Malyeyev, Artem UL; Titov, Ivan UL et al

in IUCrJ (2020), 7

Small-angle scattering of x-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering ... [more ▼]

Small-angle scattering of x-rays and neutrons is a routine method for the determination of nanoparticle sizes. The so-called Guinier law represents the low-q approximation for the small-angle scattering curve from an assembly of particles. The Guinier law has originally been derived for nonmagnetic particle-matrix-type systems, and it is successfully employed for the estimation of particle sizes in various scientific domains (e.g., soft matter physics, biology, colloidal chemistry, materials science). An important prerequisite for it to apply is the presence of a discontinuous interface separating particles and matrix. Here, we introduce the Guinier law for the case of magnetic small-angle neutron scattering (SANS) and experimentally demonstrate its applicability for the example of nanocrystalline cobalt. It is well- known that the magnetic microstructure of nanocrystalline ferromagnets is highly nonuniform on the nanometer length scale and characterized by a spectrum of continuously varying long-wavelength magnetization fluctuations, i.e., these systems do not manifest sharp interfaces in their magnetization profile. The magnetic Guinier radius depends on the applied magnetic field, on the magnetic interactions (exchange, magnetostatics), and on the magnetic anisotropy-field radius, which characterizes the size over which the magnetic anisotropy field is coherently aligned into the same direction. In contrast to the nonmagnetic conventional Guinier law, the magnetic version can be applied to fully dense random-anisotropy-type ferromagnets. [less ▲]

Detailed reference viewed: 31 (9 UL)
Full Text
See detailMagnetic Guinier Law
Malyeyev, Artem UL; Michels, Andreas UL

Poster (2019, June)

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of ... [more ▼]

We introduce the Guinier law for the case of magnetic SANS and provide an analysis of experimental data on a Nd-Fe-B-based nanocomposite and on a rare-earth-free MnBi permanent magnet. The robustness of this novel approach is discussed and the quantities derived are analyzed in the framework of the existing research literature. [less ▲]

Detailed reference viewed: 88 (14 UL)
Full Text
Peer Reviewed
See detailMagnetic Interaction with Devices: A Pilot Study on Mobile Gaming
Afshari, Saeed UL; Popleteev, Andrei UL; McCall, Roderick UL et al

in Proceedings of NordiCHI '14, October 26 - 30 2014, Helsinki, Finland (2014, October 26)

This work-in-progress paper presents a study of interaction techniques for mobile devices, with a focus on gaming scenarios. We introduce and explore usability and performance aspects of a novel compass ... [more ▼]

This work-in-progress paper presents a study of interaction techniques for mobile devices, with a focus on gaming scenarios. We introduce and explore usability and performance aspects of a novel compass based control for tangible around-device interaction, and compare it with traditional mobile gaming controls, such as touchscreen thumbstick, swiping and tilt-based approaches. [less ▲]

Detailed reference viewed: 377 (27 UL)
See detailMagnetic interactions in nanomagnets: a neutron-scattering study
Michels, Andreas UL

Presentation (2011)

Detailed reference viewed: 33 (1 UL)
See detailMagnetic interactions in nanomagnets: a neutron-scattering study
Michels, Andreas UL

Presentation (2010)

Detailed reference viewed: 23 (0 UL)
See detailMagnetic interactions in nanomagnets: a neutron-scattering study
Michels, Andreas UL

Presentation (2010)

Detailed reference viewed: 29 (1 UL)
Full Text
Peer Reviewed
See detailMagnetic microstructure and properties of the nanocrystalline hard magnet terbium
Weissmüller, J.; Michels, D.; Michels, Andreas UL et al

in Physica Status Solidi A. Applied Research (2002), 189

We present an experimental study of the magnetic properties and magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent small-angle neutron scattering (SANS) data suggest that up to ... [more ▼]

We present an experimental study of the magnetic properties and magnetic microstructure in the nanocrystalline hard magnet Tb. Field-dependent small-angle neutron scattering (SANS) data suggest that up to applied fields of several Tesla the magnetization remains locked in to the basal planes of the hcp crystal lattice of each individual crystallite; as a consequence, domain-wall movement along the basal planes is eliminated as a mechanism for magnetization reversal, and the coercive field is substantially increased. [less ▲]

Detailed reference viewed: 76 (1 UL)
Full Text
Peer Reviewed
See detailMagnetic microstructure of a textured Nd-Fe-B sintered magnet characterized by small-angle neutron scattering
Périgo, E.A.; Mettus, Denis UL; Gilbert, E.P. et al

in Journal of Alloys & Compounds (2016), 661

Detailed reference viewed: 113 (10 UL)
Full Text
Peer Reviewed
See detailMagnetic Nanorods: Genesis, Self-Organization and Applications
Birringer, R.; Wolf, H.; Lang, C. et al

in Zeitschrift für Physikalische Chemie (2008), 222(2-3), 229-255

Magnetic-field-assisted self-assembly of magnetic dipole moment carrying iron nanoparticles is shown to result in the formation of magnetic and mechanically stiff nanoscale rods. The cooperative behavior ... [more ▼]

Magnetic-field-assisted self-assembly of magnetic dipole moment carrying iron nanoparticles is shown to result in the formation of magnetic and mechanically stiff nanoscale rods. The cooperative behavior of an ensemble of such rods and bundles thereof exhibits self-organized pattern formation on different length scales. Pattern formation on large length scales reveals great similarity with physical systems undergoing spinodal decomposition. Possible applications for dipolar magnetic nanorods in the field of perpendicular storage media are highlighted. We discuss an aerosol-synthesis-route allowing to prepare ferrofluids (FF) with shape-anisotropic particles constituting the magnetic phase immersed in the nonmagnetic carrier fluid. These so-called nanorod FF unveil a two orders of magnitude increase of viscosity enforced by an applied field of 10mT even at shear rates larger than 10-2s. This raises prospects for applications in microfluidics and MEMS. [less ▲]

Detailed reference viewed: 144 (1 UL)
Full Text
Peer Reviewed
See detailMagnetic neutron scattering by magnetic vortices in thin submicron-sized soft ferromagnetic cylinders
Metlov, K.L.; Michels, Andreas UL

in Scientific Reports (2016), 6

Using analytical expressions for the magnetization textures of thin submicron-sized magnetic cylinders in vortex state, we derive closed-form algebraic expressions for the ensuing small-angle neutron ... [more ▼]

Using analytical expressions for the magnetization textures of thin submicron-sized magnetic cylinders in vortex state, we derive closed-form algebraic expressions for the ensuing small-angle neutron scattering (SANS) cross sections. Specifically, for the perpendicular and parallel scattering geometries, we have computed the cross sections for the case of small vortex-center displacements without formation of magnetic charges on the side faces of the cylinder. The results represent a significant qualitative and quantitative step forward in SANS-data analysis on isolated magnetic nanoparticle systems, which are commonly assumed to be homogeneously or stepwise-homogeneously magnetized. We suggest a way to extract the fine details of the magnetic vortex structure during the magnetization process from the SANS measurements in order to help resolving the long-standing question of the magnetic vortex displacement mode. [less ▲]

Detailed reference viewed: 124 (7 UL)
See detailMagnetic neutron scattering on bulk ferromagnets
Michels, Andreas UL

Presentation (2018, July 12)

Detailed reference viewed: 43 (7 UL)
Full Text
Peer Reviewed
See detailMagnetic neutron scattering on nanocomposites: Decrypting cross-section images using micromagnetic simulations
Erokhin, Sergey; Berkov, Dmitry; Gorn, Nataliya et al

in Physical Review. B, Condensed Matter and Materials Physics (2012), 85(134418), 1-5

Detailed reference viewed: 84 (2 UL)