scispace - formally typeset
Search or ask a question
Author

Sheldon Schultz

Bio: Sheldon Schultz is an academic researcher from University of California, San Diego. The author has contributed to research in topics: Magnetization & Plasmon. The author has an hindex of 43, co-authored 135 publications receiving 26175 citations. Previous affiliations of Sheldon Schultz include University of California & École Polytechnique Fédérale de Lausanne.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, the authors have fabricated arrays of high aspect ratio nickel columns in both PMMA and SiO2, and characterized their structure using transmission electron microscopy and scanning electron microscope.
Abstract: We have fabricated arrays of high aspect ratio nickel columns in both PMMA and SiO2, and we have characterized their structure using transmission electron microscopy and scanning electron microscopy. We have also characterized the magnetics of the columns with magnetic force microscopy. Such characterization of high aspect ratio perpendicular magnetic particles is only rarely found in the literature. This work lays a foundation for further studies to test the viability of lithographically defined arrays of magnetic particles as an alternative high density storage medium.

74 citations

Journal ArticleDOI
TL;DR: Superconductivity at 20 K has been unambiguously observed in the Tl-Sr-Ca-Cu-O system and this observation may provide a new insight into the mechanism of oxide superconductivity.
Abstract: Superconductivity at 20 K has been unambiguously observed in the Tl-Sr-Ca-Cu-O system. Superconductivity at 70 K was also observed in the same system. These observations may provide a new insight into the mechanism of oxide superconductivity.

73 citations

Journal ArticleDOI
TL;DR: In this paper, the first observation of conduction-electron spin resonance in pure silver was reported, where the authors used an extended Hasegawa model to account for some significant anomalies.
Abstract: Detailed measurements of the transmission spin resonance in dilute Cu-Mn and preliminary measurements in dilute Ag-Mn alloys have been made over the range 1.4-35\ifmmode^\circ\else\textdegree\fi{}K. While many of the features of the conduction-electron-local-moment system are accounted for by an extended Hasegawa model, some significant anomalies remain. The first observation of conduction-electron spin resonance in pure silver is reported.

71 citations

Journal ArticleDOI
TL;DR: Nickel cylinders were grown by electroplating into Al/sub 2/O/sub 3/ membranes and they have various lengths and radius around 20 /spl mu/m and 0.15 /spl µ/m respectively, they are highly crystalline and of constant radius throughout their length.
Abstract: Nickel cylinders were grown by electroplating into Al/sub 2/O/sub 3/ membranes. They have various lengths and radius around 20 /spl mu/m and 0.15 /spl mu/m respectively, they are highly crystalline and of constant radius throughout their length. Magnetic Force Microscopy indicates that they are single domain and that the reversal mechanism for the magnetization is indicative of curling for all angles between the anisotropy axis and the field direction, but independent of radius.

66 citations

Journal ArticleDOI
TL;DR: BaCuO2 is found to be the main source of the low-temperature EPR signal and of the magnetic susceptibility which has been reported for YBa2Cu3O9-x above Tc.
Abstract: Many electron-paramagnetic-resonance (EPR) and magnetic susceptibility measurements for the high-Tc superconductors of the form RBa2Cu3O9-x (R=Y or a rare earth) have been reported. Excluding local moment resonances due solely to the R atoms, we show that all of the EPR measurements known to us are not intrinsic to the superconducting phase, but rather are due to low concentrations of spurious phases typically present in the samples. BaCuO2 is found to be the main source of the low-temperature EPR signal and of the magnetic susceptibility which has been reported for YBa2Cu3O9-x above Tc. © 1987 The American Physical Society.

65 citations


Cited by
More filters
Journal ArticleDOI
14 Aug 2003-Nature
TL;DR: By altering the structure of a metal's surface, the properties of surface plasmons—in particular their interaction with light—can be tailored, which could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved.
Abstract: Surface plasmons are waves that propagate along the surface of a conductor. By altering the structure of a metal's surface, the properties of surface plasmons--in particular their interaction with light--can be tailored, which offers the potential for developing new types of photonic device. This could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved. Surface plasmons are being explored for their potential in subwavelength optics, data storage, light generation, microscopy and bio-photonics.

10,689 citations

Journal ArticleDOI
TL;DR: Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems as discussed by the authors, where the primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport.
Abstract: Spintronics, or spin electronics, involves the study of active control and manipulation of spin degrees of freedom in solid-state systems. This article reviews the current status of this subject, including both recent advances and well-established results. The primary focus is on the basic physical principles underlying the generation of carrier spin polarization, spin dynamics, and spin-polarized transport in semiconductors and metals. Spin transport differs from charge transport in that spin is a nonconserved quantity in solids due to spin-orbit and hyperfine coupling. The authors discuss in detail spin decoherence mechanisms in metals and semiconductors. Various theories of spin injection and spin-polarized transport are applied to hybrid structures relevant to spin-based devices and fundamental studies of materials properties. Experimental work is reviewed with the emphasis on projected applications, in which external electric and magnetic fields and illumination by light will be used to control spin and charge dynamics to create new functionalities not feasible or ineffective with conventional electronics.

9,158 citations

Journal ArticleDOI
06 Apr 2001-Science
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.
Abstract: We present experimental scattering data at microwave frequencies on a structured metamaterial that exhibits a frequency band where the effective index of refraction (n) is negative. The material consists of a two-dimensional array of repeated unit cells of copper strips and split ring resonators on interlocking strips of standard circuit board material. By measuring the scattering angle of the transmitted beam through a prism fabricated from this material, we determine the effective n, appropriate to Snell's law. These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root of epsilon.mu for the frequencies where both the permittivity (epsilon) and the permeability (mu) are negative. Configurations of geometrical optical designs are now possible that could not be realized by positive index materials.

8,477 citations

Journal ArticleDOI
TL;DR: Recent advances at the intersection of plasmonics and photovoltaics are surveyed and an outlook on the future of solar cells based on these principles is offered.
Abstract: The emerging field of plasmonics has yielded methods for guiding and localizing light at the nanoscale, well below the scale of the wavelength of light in free space. Now plasmonics researchers are turning their attention to photovoltaics, where design approaches based on plasmonics can be used to improve absorption in photovoltaic devices, permitting a considerable reduction in the physical thickness of solar photovoltaic absorber layers, and yielding new options for solar-cell design. In this review, we survey recent advances at the intersection of plasmonics and photovoltaics and offer an outlook on the future of solar cells based on these principles.

8,028 citations

Journal ArticleDOI
23 Jun 2006-Science
TL;DR: This work shows how electromagnetic fields can be redirected at will and proposes a design strategy that has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.
Abstract: Using the freedom of design that metamaterials provide, we show how electromagnetic fields can be redirected at will and propose a design strategy. The conserved fields-electric displacement field D, magnetic induction field B, and Poynting vector B-are all displaced in a consistent manner. A simple illustration is given of the cloaking of a proscribed volume of space to exclude completely all electromagnetic fields. Our work has relevance to exotic lens design and to the cloaking of objects from electromagnetic fields.

7,811 citations