English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present the development of a far-field magneto-optical Kerr effect microscope. An inverted optical microscope was constructed to accommodate Kerr imaging and atomic force microscopy. In Kerr microscopy, magnetic structure is investigated by measuring the polarization rotation of light reflected from a sample in the presence of a magnetic field. Atomic force microscopy makes use of a probe which is scanned over a sample surface to map the topography. The design was created virtually in SolidWorks, a three-dimensional computer-aided drafting environment, to ensure compatibility and function of the various components, both commercial and custommachined, required for the operation of this instrument. The various aspects of the microscope are controlled by custom circuitry and a field programmable gate array data acquisition card at the direction of the control code written in National Instrument LabVIEW. The microscope has proven effective for both Kerr and atomic force microscopy. Kerr images are presented which reveal the bit structure of magnetooptical disks, as are atomic force micrographs of an AFM calibration grid. Also discussed is the future direction of this project, which entails improving the resolution of the instrument beyond the diffraction limit through near-field optical techniques. Preliminary work on fiber probe designs is presented along with probe fabrication work and the system modifications necessary to utilize such probes. i Acknowledgments I wish to thank the members of the Sánchez Nano-Development Lab in the physics department of Portland State University. This work could not have been successful without their continued advice and support. These include undergraduate research students Cliff Kim, Joe Parks, Kyle Juedes, Allan Dunham, Justin Hiester, and Noah Brummer; Master’s students Deepak Vedhachalam, Philip Witham, and John Mitchell; and doctoral students Dr. Mohan Vattipalli, Randy Smith, Richard Swinford, Jeff Doughty, and Mike DeArmond. Zechariah Dzegede contributed directly to this project with work on the LabVIEW code, and Amber Lauer designed and built the electromagnet. The author is particularly grateful for the assistance and guidance of Dr. Derek Nowak. His initial development of the microscope control systems was absolutely essential to the success of this project, and his additional contributions cannot be overstated. I am thankful to Portland State University for the use of their facilities, and specifically the physics department for academic and financial support, as well as the PSU support staff, including Marc Nisenfeld and Chuck Heino for assistance with machining and Anne Keech and Kim Doty-Harris for administrative support. I am also grateful to the various funding agencies who have supported this work. These include the National Science Foundation, the Office of Naval Research, the Western Institute of Nanoelectronics, the Semiconductor Research Corporation, the UC Discovery Grant, the Nanoelectronics Research Initiative, the Nanoelectronics Research Corporation, Intel, and the Oregon Nanoscience and Microtechnologies Institute. I wish to thank my thesis committee for taking their time to evaluate this work. These include Dr. John Freeouf, Dr. Dean Atkinson, and advisor Dr. Erik J. Sánchez, to whom I am especially appreciative for his continued support and instruction. Finally, and most importantly, I am grateful to my friends and family who have supported me all these years.

Development of a Hybrid Atomic Force and Scanning Magneto-Optic Kerr Effect Microscope for Investigation of Magnetic Domains