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Search Publications by: William Rippard (Fed)

Displaying 101 - 107 of 107

Materials dependence of the spin-momentum transfer efficiency and critical current in ferromagnetic metal/Cu multilayers

July 14, 2003

Author(s)

Matthew Pufall, William Rippard, Thomas J. Silva

We have quantitatively compared spin momentum transfer effects in FM/Cu multilayers, with FM = Co, Co 90Fe 10, Ni 80Fe 20, Ni 40Fe 10Cu 50, and Fe. All of the measured multilayers exhibited an abrupt step in the resistance at a critical current I c, the

Magneto-optic effects in spin-injection devices

June 23, 2003

Author(s)

Steve Ruggiero, Anthony Williams, Carol Tanner, S. Potashnik, John M. Moreland, William Rippard

The magneto-optic properties of semi-transparent ferromagnetic films are presented in the context of ferromagnet/GaAs spin-injection devices. We have measured the polarization-dependent photoresponse and magneto-optic properties of Co/i}n-GaAs, Co/p-GaAs

T c Suppression in Superconducting Films for use in Transition Edge Sensors

June 1, 2003

Author(s)

Steven Deiker, Gene C. Hilton, Kent D. Irwin, William Rippard, Steve Ruggiero, Leila R. Vale, B. A. Young

Transition edge sensor (TES) microcalorimeters have proved their value as photon detectors in several wavelength regimes. The central elecement of a TES is a superconducting film with a transition temperature designed to be at a specific temperature

Quantitative Studies of Spin-Momentum-Transfer-Induced Excitations in Co/Cu Multilayer Films Using Point-Contact Spectroscopy

February 24, 2003

Author(s)

William Rippard, Matthew Pufall, Thomas J. Silva

We have measured current-induced magnetic excitations in a variety of exchange-coupled Co/Cu multilayers using point-contact spectroscopy. A step in the DC resistance and corresponding peak in dV/dI are observed at a critical current Ic whose value