TITLE

Temperature and field dependence of high-frequency magnetic noise in spin valve devices

AUTHOR(S)
Stutzke, N.; Burkett, S. L.; Russek, S. E.
PUB. DATE
January 2003
SOURCE
Applied Physics Letters;1/6/2003, Vol. 82 Issue 1, p91
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The high-frequency noise of micrometer-dimension spin valve devices has been measured as a function of applied field and temperature. The data are well fit with single-domain noise models that predict that the noise power is proportional to the imaginary part of the transverse magnetic susceptibility. The fits to the susceptibility yield the ferromagnetic resonance (FMR) frequency and the magnetic damping parameter. The resonant frequency increases, from 2.1 to 3.2 GHz, as the longitudinal field varies from -2 to 4 mT and increases from 2.2 to 3.3 GHz as the temperature decreases from 400 to 100 K. The shift in the FMR frequency with temperature is larger than that expected from the temperature dependence of the saturation magnetization, indicating that other temperature-dependent anisotropy energies are present, in addition to the dominant magnetostatic energies. The measured magnetic damping parameter α decreases from 0.016 to 0.006 as the temperature decreases from 400 to 100 K. The value of the damping parameter shows a peak as a function of longitudinal bias field, indicating that there is no strict correlation between the damping parameter and the resonant frequency.
ACCESSION #
8781305

 

Related Articles

  • Magnetic interactions in homometallic chains M(4-cyanopyridine)2Cl2, M=Cu,Ni,Co. Zhang, Wanru; Landee, Christopher P.; Turnbull, Mark M.; Willett, Roger D. // Journal of Applied Physics;5/15/1993, Vol. 73 Issue 10, p5379 

    Deals with a study which determined the crystal structure of the copper compound. Chemical components of the copper compound; Measurement of power susceptibilities; Power susceptibility as a function of temperature of the copper analog.

  • Inductive noise thermometer: Theoretical aspects. Seppä, Heikki; Varpula, Timo // Journal of Applied Physics;7/15/1993, Vol. 74 Issue 2, p771 

    Deals with a study which described a noncontacting method for measuring the temperature of electrically conducting objects through the detection of magnetic field noise. Principle of the inductive noise thermometer; Applications; Conclusion.

  • Magnetic properties of CdxZnyMnzTe alloys. Donofrio, T.; Lamarche, G.; Woolley, J. C. // Journal of Applied Physics;3/15/1985, Vol. 57 Issue 6, p1937 

    Reports on the low-field measurements of magnetic susceptibility as a function of temperature on polycrystalline samples of the alloy system. Properties of the pseudoternary alloy system; Device used in the measurement of magnitization; Temperation variation of the susceptibility for the sample.

  • Magnetic susceptibility of RCo3B2 (R=Y, Sm, Gd, and Dy). Ido, H.; Nanjo, M.; Yamada, M. // Journal of Applied Physics;5/15/1994, Vol. 75 Issue 10, p7140 

    Deals with a study which measured the temperature dependence of magnetic susceptibility of RCo[sub3]B[sub2]. Background to the study; Sample preparation and x-ray analysis; Magnetic measurements; Discussion of the results.

  • A system for in-situ pressure and ac susceptibility measurements using the diamond anvil cell: Tc(P) for HgBa2CuO4+δ. Kim, Charles C.; Reeves, M. E.; Osofsky, M. S.; Skelton, E. F.; Liebenberg, D. H. // Review of Scientific Instruments;Apr94, Vol. 65 Issue 4, p992 

    Substantial improvements have been made in the sensitivity of an ac susceptibility measurement system which determines the pressure dependence of the superconducting transition temperature, T[sub c](P). The pressure, P, is determined near T[sub c] from the position of the R[sub 1] and R[sub 2]...

  • Effect of thermal broadening on the paramagnetic susceptibility of the Invar alloys Fe[sub 65]Ni[sub 35] and Fe[sub 72]Pt[sub 28]. Zverev, V. M. // Physics of the Solid State;Feb98, Vol. 40 Issue 2, p248 

    Experimental data is used to show that bulk thermal broadening makes a considerable contribution to the Curie constants of the Invar alloys Fe[sub 65]Ni[sub 35] and Fe[sub 72]Pt[sub 28].

  • Quasi-one-dimensional antiferromagnetism in FeC2O4 · 2H2O. Chen, Jiing-Yann; Simizu, Satoru; Friedberg, S. A. // Journal of Applied Physics;4/15/1985, Vol. 57 Issue 8, p3338 

    Presents a study which reported the magnetic susceptibility and heat capacity measurements of ferrous oxalate dihydrate. Methodology; Results; Discussion.

  • Magnetic properties of mixed crystals with NiAs-type structure. Ido, H. // Journal of Applied Physics;4/15/1985, Vol. 57 Issue 8, p3247 

    Deals with a study which measured magnetic properties of mixed crystals with NiAs type structure. Background on Curie temperature; Measurement of magnetic moment per manganese atom; Description of magnetic susceptibility.

  • Low temperature magnetic properties of U1-xPrxAl2. Kuwai, T.; Miyako, Y. // Journal of Applied Physics;11/15/1991, Vol. 70 Issue 10, p5797 

    Studies the low temperature properties of U[sub1-x]Pr[subx]Al[sub2] polycrystals using susceptibility and specific heat measurements down to 100mK, focusing attention on the mechanisms of spin fluctuations. Susceptibility and specific heat of the polycrystals.

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