L.S. Kirschenbaum GMR Publications Page

L.S. Kirschenbaum GMR Publications Page

Last modified 9/5/96
Following are links to the texts of abstracts for papers and conferences I've attended: A link to the abstract of my dissertation:
Low Frequency Resistance Noise of Several NiFe Giant Magnetoresistance Systems

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THE FOLLOWING REFERENCES MAY NOT BE COMPLETE

The abstract texts are accurate.


American Physical Society 1994 March Meeting Abstract:
title
L. S. Kirschenbaum, S. T. Rogers, University of Colorado, Boulder, Colorado, 80309-0390, S. E. Russek, S. C. Sanders, Electromagnetic Technology Division, National Insitute of Standards and Technology, Boulder, CO, 80303, M. R. Parker, MINT, AL,
text text text
INTERMAG '95 paper published in IEEE Transactions on Magnetics:
IEEE Trans. Magn. 31, 3943 (1995).
Telegraph Noise in Silver-Permalloy Giant Magnetoresistance Test Structures
L. S. Kirschenbaum, C. T. Rogers, University of Colorado, Boulder, Colorado 80309-0390, S.E. Russek, S. C. Sanders Electromagnetic Technology Division, National Institute of Standards and Technology, Boulder, Colorado 80303
We report noise data for discontinuous Ni82Fe18/ Ag multilayer test structures. Examination of the noise data for this material indicates that random telegraph fluctuator (RTF) noise of the resistance is the predominant noise source. Analysis of the RTF noise in these structures presents an opportunity to estimate magnetic domain or magnetic cluster strengths and the domain-domain interactions.
American Physical Society 1996 March Meeting Abstract:
Bias Current Dependent Magnetoresistance Peaks and Low Frequency Noise in NiFe/Ag Multilayers
L.S. Kirschenbaum, C. T. Rogers, P. D. Beale, Condensed Matter Laboratory, University of Colorado at Boulder, S. E. Russek, S. C. Sanders, National Institute of Standards and Technology, Boulder, CO
Ni82Fe18/Ag multilayers display multiple peaks in their magnetoresistance (MR) curves when biased at current densities of 106 - 107 A/cm2. These peaks appear for annealed and unannealed structures and their number is correlated with the number of NiFe layers. Their positions shift linearly with the internal magnetic field created by high bias currents and extrapolate to non-zero fields at zero bias currents. The peak positions do not shift with temperature over the range 200 K - 375 K, although their widths appear to narrow with increasing temperature. Resistance fluctuations at fixed DC bias currents increase by an order of magnitude under the peaks in the MR curves, implying that the peaks are linked to fluctuations of the layer magnetizations. The single domain magnetic moment, u, is estimated as roughly 106 uB from the peak widths of 0.8 kA/m and the magnetic layer-layer coupling strength J is estimated as 1 x 10-20 J. A linear Kerr effect apparatus has been recently constructed which permits direct measurement of average surface layer magnetization orientation. Comparison between Kerr data, the MR peaks, and resistance noise spectra will be presented.
INTERMAG '96 paper published in IEEE Transactions on Magnetics:
IEEE Trans. Magn. 32, ???? (1996).
High Current Density Self-Field Effects and Low-Frequency Noise in NiFe/Ag GMR Multilayers
L. S. Kirschenbaum, C. T. Rogers, P. D. Beale, Condensed Matter Laboratory, University of Colorado, Boulder, CO 80309-0390, S. E. Russek, S. C. Sanders, Electromagnetic Technology Division, National Institute of Standards and Technology, Boulder, CO 80303-3328
High current densities (106-107 A/cm2) produce magnetic fields which can induce antiparallel magnetic alignment in large (16 um and 8 um) NiFe/Ag thin film multilayer devices. We induce GMR in unannealed devices which normally do not display GMR. We find multiple peaks in the magnetoresistance curves of annealed and unannealed devices. Analysis of the positions and shapes of these magnetoresistance peaks provides a new set of tools for determining the micromagnetic structure of the multilayers. Our magneto-optical Kerr effect data and low frequency noise data correlate with the magnetoresistance peaks and may yield further information about layer-layer interactions and domain structure.
Appl. Phys. Lett. 68 3099 (1996). {27 May 1996}
Bias current dependent resistance peaks in NiFe/Ag giant magnetoresistance multilayers
L. S. Kirschenbaum, C. T. Rogers, P. D. Beale
Condensed Matter Laboratory, Department of Physics, University of Colorado, Boulder, Colorado 80309-0390
S. E. Russek, S. C. Sanders
National Institute of Standards and Technology, Boulder, Colorado 80303-3328
We show that thin-film Ni82Fe18/Ag multilayer structures display multiple peaks in their magnetoresistance curves when biased at current densities above 106 A/cm2. These peaks appear for annealed and unannealed structures, and their number is correlated with the number of NiFe layers. At high bias currents, the peak positions shift linearly with the internal magnetic field created by the bias current. The peak positions extrapolate to nonzero fields at zero bias currents, providing an upper bound on the magnetic layer-layer coupling strength of J0 10-20 J (kB x 700 K). The peak positions do not shift with temperature over the range 200 to 375 K; their widths narrow with increasing temperature. The single-domain magnetic moment u is estimated as 10-17 J/T (106 uB) from the peak widths of ~0.8 kA/m.
INTERMAG '97 paper to be published in IEEE Transactions on Magnetics:
IEEE Trans. Magn. 33, ???? (1997).
{Low-Frequency Noise of NiFe/Cu Spin Valves}
L. S. Kirschenbaum, C. T. Rogers, Condensed Matter Laboratory, University of Colorado, Boulder, CO 80309-0390, S. E. Russek, S. C. Sanders, Electromagnetic Technology Division, National Institute of Standards and Technology, Boulder, CO 80303-3328, Y. K. Kim, Quantum Corporation, Louisville, CO zipcode
(paper not yet written)
Low Frequency Resistance Noise of Several NiFe Giant Magnetoresistance Systems
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