TITLE

Quantitative studies of spin-momentum-transfer-induced excitations in Co/Cu multilayer films using point-contact spectroscopy

AUTHOR(S)
Rippard, W. H.; Pufall, M. R.; Silva, T. J.
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/24/2003, Vol. 82 Issue 8, p1260
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
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 I[SUBc] (whose value depends linearly on applied magnetic field B[SUBapp], in agreement with Slonczewski's theory. These features are observed for both in- and 8 out-of-plane fields. Excitations in ferromagnetically coupled films occur even without an applied field. The spin transfer efficiency is determined from the slope and intercept of I[SUBc] (vs) B[SUBapp] and varied from contact to contact. For out of plane magnetized samples, the deduced spin transfer efficiency values are in good agreement with the predictions of Slonczewski.
ACCESSION #
9140738

 

Related Articles

  • Spectrum analyzer for low magnetic field. Aroca, C.; Prieto, J.L.; Sanchez, P.; Lopez, E.; Sanchez, M.C. // Review of Scientific Instruments;Nov95, Vol. 66 Issue 11, p5355 

    Describes a spectrum analyzer that was developed to obtain an estimate of the spectrum of a time-variable magnetic field. Applications of the measurement of alternating low-amplitude magnetic fields; Detector setup; Operating procedure.

  • Environment effects on effective magnetic exchange integrals and local spectroscopy of extended strongly correlated systems. Lepetit, Marie-Bernadette; Suaud, Nicolas; Gelle, Alain; Robert, Vincent // Journal of Chemical Physics;3/1/2003, Vol. 118 Issue 9, p3966 

    The present work analyzes the importance of the different components of the environment effects on the local spectroscopy of extended, strongly-correlated systems. It has been found that the usual formal charge definition of the charge transfer and Madelung potential are far too crude for an...

  • A Study of the Regularities in Solar Magnetic Activity by Singular Spectral Analysis. Loskutov, A. Yu.; Istomin, I. A.; Kotlyarov, O. L.; Kuzanyan, K. M. // Astronomy Letters;Nov2001, Vol. 27 Issue 11, p745 

    The method of singular spectral analysis (SSA) is described and used to analyze the series of Wolf numbers that characterizes solar activity from 1748 until 1996. Since this method is relatively new, we detail its algorithm as applied to the data under study. We examine the advantages and...

  • Effect of phasons and magnetic fields on the electronic spectrum of a three-dimensional quasicrystal. Vekilov, Yu. Kh.; Slobodyanyuk, P. V.; Isaev, �. I.; Arslanov, S. F. // JETP Letters;5/10/99, Vol. 69 Issue 9, p701 

    The effect of phasons and magnetic fields on the electronic spectrum of an icosahedral quasicrystal is investigated in the tight-binding approximation. Phasons smooth the singular spectrum and produce a greater delocalization of the critical wave functions. A magnetic field shifts the limits of...

  • Electrical conductivity of glass and sapphire cells exposed to dry cesium vapor. Bouchiat, M.A.; Guéna, J.; Jacquier, Ph.; Lintz, M.; Papoyan, A.V. // Applied Physics B: Lasers & Optics;1999, Vol. 68 Issue 6, p1109 

    Abstract. We demonstrate that the walls of glass cells become electrically conductive when exposed to a dry cesium vapor, glasses of different compositions leading to similar effects. We find dramatically different results for monocrystalline sapphire cells, which exhibit typical resistances of...

  • Operation of an E || B end-loss ion spectrometer on the Tara tandem mirror. Casey, J. A.; Horne, S. F.; Irby, J. H.; Post, R. S.; Sevillano, E.; Foote, J. H. // Review of Scientific Instruments;Aug1988, Vol. 59 Issue 8, p1664 

    An E B end-loss ion spectrometer from the Livermore TMX-U tandem mirror experiment was installed on Tara for high-resolution ion spectroscopy. This diagnostic contains parallel electric and magnetic fields, separating the masses and energies of the ions over 128 collector plates. The ion energy...

  • Molecular beam optical Zeeman spectroscopy of iridium mononitride. Steimle, T. C.; Marr, A. J. // Journal of Chemical Physics;2/8/1997, Vol. 106 Issue 6, p2073 

    Analyzes high resolution electronic spectra recorded in the presence of a static magnetic field for iridium mononitride, IrN. Zeeman effect on the hyperfine component in the transition of IrN; Use of a supersonic molecular beam optical spectrometer; Magnetic factor for IrN; Description of the...

  • Sub-Doppler Zeeman spectroscopy of the CeO molecule. Schall, H.; Gray, J. A.; Dulick, M.; Field, R. W. // Journal of Chemical Physics;7/15/1986, Vol. 85 Issue 2, p751 

    Sub-Doppler Zeeman spectra of several low-J rotational lines in 0–0 bands of CeO[16.5]2–X12, [16.5]4–X23, [18.4]4–X34, and [19.3]3–X43 systems have been recorded by intermodulated fluorescence spectroscopy. Electronic g values for the four lower states [the...

  • The atmospheres of helium-deficient Bp stars. Glagolevskij, Yu.V.; Leushin, V.V.; Chuntonov, G.A.; Shulyak, D. // Astronomy Letters;Jan2006, Vol. 32 Issue 1, p54 

    Based on spectra taken with a 6-m telescope, we analyzed the abundances of chemical elements in the He-weak stars HD 21699 and HD 217833, estimated their surface magnetic fields (Bs = 4000 and 4500 G, respectively) from the magnetic intensification of spectral lines, and determined their...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics