Carbon: A bane for giant magnetoresistance magnetic multilayers

Yang, David X.; Chopra, Harsh Deep; Shashishekar, B.; Chen, P. J.; Egelhoff, W. F.
April 2002
Applied Physics Letters;4/22/2002, Vol. 80 Issue 16, p2943
Academic Journal
This study reports the highly deleterious role of a small amount of carbon on the structure and magnetic properties of “giant” magnetoresistance (GMR) NiO–Co–Cu-based spin valves. Controlled incorporation of 1–3 at. % carbon in the Co/Cu layers has been shown to completely eliminate the GMR effect. The presence of carbon gives rise to highly discontinuous Co/Cu layers, resulting in the formation of pinholes, and associated degradation of structure-sensitive magnetic properties. In addition, carbon promotes the formation of a high density of stacking faults in the Co/Cu layers, with carbon nanoprecipitates forming in the vicinity of the stacking faults. Results have implications for other multilayers and magnetoelectronics devices. © 2002 American Institute of Physics.


Related Articles

  • Exchange-biased spin valves combining a high magnetoresistance ratio with soft-magnetic behavior. Kools, J. C. S.; Lardoux, S.; Roozeboom, F. // Applied Physics Letters;2/2/1998, Vol. 72 Issue 5 

    We report on the preparation of bottom spin valves combining a high giant magnetoresistance effect (above 10%) with a soft-magnetic behavior (coercivities of a few hundreds of A/m). By optimization of film composition and preparation conditions, it is possible to obtain materials having...

  • Perpendicular giant magnetoresistance of CoFeB/Cu single and dual spin-valve films. Oshima, Hirotaka; Nagasaka, Keiichi; Seyama, Yoshihiko; Shimizu, Yutaka; Eguchi, Shin; Tanaka, Atsushi // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p8105 

    We present giant magnetoresistance measurements in the current-perpendicular-to-plane mode on single and dual spin valves whose areas are from 0.1 to 1.0 µm². Dependence on the magnetic layer thickness and the structure was investigated. It was revealed that magnetoresistance change...

  • Current-in-plane pseudo-spin-valve device performance for giant magnetoresistive random access memory applications (invited). Katti, R. R. // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p7245 

    Write and read characteristics of current-in-plane pseudo-spin-valve (PSV) devices are demonstrated in terms of switching, resistive, and magnetoresistive properties of individual PSV devices and ensembles of PSV devices. Characteristics of PSV devices are described that are necessary and...

  • The trade-off between large magnetoresistance and small coercivity in symmetric spin valves. Egelhoff, W. F.; Chen, P. J.; Powell, C. J.; Stiles, M. D.; McMichael, R. D.; Lin, C.-L.; Sivertsen, J. M.; Judy, J. H.; Takano, K.; Berkowitz, A. E. // Journal of Applied Physics;6/1/1996, Vol. 79 Issue 11, p8603 

    Provides information on a study that investigated the possible extensions to the limits of the compromise in giant magnetoresistance by using alternatives to pure cobalt as the center film in symmetric spinning valves. Experimental procedure; Results and discussion on the study; Conclusions.

  • Barrier dependence of magnetoresistance enhancement in nano-oxide added spin valves. Li, Kebin; Wu, Yihong; Qiu, Jinjun; Chong, Towchong // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p8563 

    The effects of different types of nano-oxides on the properties of spin valves have been studied. The nano-oxides that have been investigated in this study include NiFe-O, A1-O, CoFe-O, Ta-O, and Cu-O. From the point of view of overall properties (magnetoresistance ratio, change of sheet...

  • Coherently suppressed ringing of the magnetization in microscopic giant magnetoresistive devices. Schumacher, H. W.; Chappert, C.; Crozat, P.; Sousa, R. C.; Freitas, P. P. // Journal of Applied Physics;5/15/2002 Part 1, 2 & 3, Vol. 91 Issue 10, p8043 

    We study the magnetotransport response of 1 µm×4 µm size spin valve elements to ultrashort (pulse length 0.2-4 ns) easy axis magnetic field pulses. When applying an additional static hard axis field, pronounced magnetic precession is observed in the magnetoresistance. Damped precession...

  • Extension of the semiclassical theory of current-perpendicular-to-plane giant magnetoresistance including spin flip to any multilayered magnetic structures. Strelkov, N.; Vedyaev, A.; Dieny, B. // Journal of Applied Physics;9/1/2003, Vol. 94 Issue 5, p3278 

    In the framework of the Valet and Fert theory of current perpendicular to plane (CPP) giant magnetoresistance (GMR) in metallic multilayers [Valet and Fert, Phys. Rev. B 48, 7099 (1993)], the calculation of the CPP resistance and magnetoresistance has been generalized to any multilayered stacks...

  • Iron nanoparticle driven spin-valve behavior in aligned carbon nanotube arrays. Bergeson, J. D.; Etzkorn, S. J.; Murphey, M. B.; Qu, L.; Yang, J.; Dai, L.; Epstein, A. J. // Applied Physics Letters;10/27/2008, Vol. 93 Issue 17, p172505 

    We report the operation of spin-valve structures formed from arrays of aligned carbon nanotubes. The devices require only one deposited ferromagnetic layer with the embedded iron catalyst nanoparticle serving as the other magnetic electrode. A peak in the resistance occurs clearly as a result of...

  • Supramolecular spin valves. Urdampilleta, M.; Klyatskaya, S.; Cleuziou, J-P.; Ruben, M.; Wernsdorfer, W. // Nature Materials;Jul2011, Vol. 10 Issue 7, p502 

    Magnetic molecules are potential building blocks for the design of spintronic devices. Moreover, molecular materials enable the combination of bottom-up processing techniques, for example with conventional top-down nanofabrication. The development of solid-state spintronic devices based on the...


Read the Article


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

Try another library?
Sign out of this library

Other Topics