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Dissertation, Shane White.pdf (3.77 MB)

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Study of Heavy Metal/Ferromagnetic Films Using Electrical Detection and Local Ferromagnetic Resonance Force Microscopy

White, Shane Paul, White
http://rave.ohiolink.edu/etdc/view?acc_num=osu1524172007784423

Abstract Details

2018, Doctor of Philosophy, Ohio State University, Physics.
Spintronics is an emerging field of physics in which the spin degree of freedom of the electron is used instead of the charge. Transferring information through the use of the electron spin has the promise of lower energy consumption and improved functionality over conventional electronic devices, such as non-volatile random access memory in computers. In order to realize these benefits, systems need to be characterized and studied to understand how ferromagnetic (FM) materials behave on the nanoscale and in proximity to non-magnetic (NM) metals. Generation and detection of spin transport in these systems is essential for device operation, calling for sensitive tools and techniques to be developed. A promising technique for the study of FM systems, as well as a source of spin useful for information processing, is that of ferromagnetic resonance (FMR). Internal fields, spin dynamics, and coupling to nearby materials can be probed with spectroscopic precision through this technique. Generation of spin currents, useful for spintronic devices, is accomplished through the phenomenon of spin pumping; where the angular momentum of a FM material during resonance is transferred into a nearby NM material. This dissertation will detail two systems in which FMR is used to study ferromagnetic films in direct contact with heavy metal films. First, the technique of FMR is applied to an all metallic system and is used to gain information on spin pumping, and spin to charge conversion, in platinum films. Through the effect of magnetoresistance, the resonance of the FM material is electrically detected and the precession cone angle is measured directly. An angular dependence at multiple applied currents is used to separate rectification and spin to charge conversion, giving a calibration for the inverse spin Hall effect in the Pt film. Second, the technique of magnetic resonance is incorporated into a force microscope to gain spatial resolution not typically available in conventional measurements. The first measurements obtained using magnetic resonance force microscopy (MRFM) were performed on paramagnetic spins. Similar to typical magnetic resonance imaging (MRI), a sensitive slice is created from the gradient of the dipolar field of a magnetic cantilever tip in a magnetic sample, allowing the detection of spins within the slice. Using this technique, single spins have been detected. Here, we use the technique of MRFM with FM samples (FMRFM) whose strong spin-spin coupling creates localized resonance modes rather than single spin excitations. These localized modes are confined spin waves in the FM film, through which spatially varying magnetic textures are mapped. The textures measured here are created by patterned gold films on thin yttrium iron garnet (YIG) films, where the interface between the two materials is found to alter the effective magnetic field in the YIG.
P. Chris Hammel (Advisor)
Jonathan Pelz (Committee Member)
Nandini Trivedi (Committee Member)
Michael Poirier (Committee Member)
166 p.
Condensed Matter Physics; Physics
Ferromagnetic resonance; FMR; Force microscopy; Localized modes; Electrical detection; ISHE; Inverse spin Hall effect; AMR; Anisotropic magnetoresistance; FMRFM; YIG; Yttrium iron garnet

Recommended Citations

Citations

  • White, White, S. P. (2018). Study of Heavy Metal/Ferromagnetic Films Using Electrical Detection and Local Ferromagnetic Resonance Force Microscopy [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524172007784423

    APA Style (7th edition)

  • White, White, Shane. Study of Heavy Metal/Ferromagnetic Films Using Electrical Detection and Local Ferromagnetic Resonance Force Microscopy. 2018. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1524172007784423.

    MLA Style (8th edition)

  • White, White, Shane. "Study of Heavy Metal/Ferromagnetic Films Using Electrical Detection and Local Ferromagnetic Resonance Force Microscopy." Doctoral dissertation, Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1524172007784423

    Chicago Manual of Style (17th edition)

osu1524172007784423
464
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