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Radiation Damage in GMR Spin Valves

Carroll, Turhan Kendall
http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368

Abstract Details

2010, Master of Science, Ohio State University, Physics.
The GMR effect has revolutionized the information technology industry. GMR read-out heads, MRAM and magnetic field sensors have become standard technologies of today’s society, while magnetic random access memory (MRAM) is one of several applications of this effect which are in earlier stages. The presumption is that these materials are radiation hard with respect to both photons and particles, potentially indicating utility for nuclear energy and space based applications. However, few detailed studies of magnetism in GMR devices have been performed in radioactive environments. This work explores the effects of gamma ray and neutron irradiation on GMR spin valves. The sample structure used in this experiment is Py/Cu/Py/FeMn/Ge. To study the effects of radiation three probes of magnetization, VSM, MR, and MOKE, are correlated pre and post radiation. We present characterization of the devices for multiple device geometries and doses up to 50Mrad for gamma rays and a minimum fast flux of (En>0.5MeV) of 6.3E12 nv for neutrons, both of which are well above the failure threshold for radiation-hard semiconducting devices. We found that these devices were hard to both gamma and neutron irradiation, but that there were environmental factors that caused accelerated aging of our samples during the gamma irradiation experiment. We show follow-up studies based on these results, and future experiments that are currently in their early stages.
Ezekiel Johnston-Halperin, PhD (Advisor)
Jay Gupta, PhD (Committee Member)
83 p.
Materials Science; Physics
Radiation Damage; Giant Magnetoresistance; Radiation in Spin Valves; Neutron damage in magnetic metals; gamma damage in magnetic metals

Recommended Citations

Citations

  • Carroll, T. K. (2010). Radiation Damage in GMR Spin Valves [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368

    APA Style (7th edition)

  • Carroll, Turhan. Radiation Damage in GMR Spin Valves. 2010. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368.

    MLA Style (8th edition)

  • Carroll, Turhan. "Radiation Damage in GMR Spin Valves." Master's thesis, Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1281633368

    Chicago Manual of Style (17th edition)

osu1281633368
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© 2010, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.