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IInvestigation of Magnetostatics of Exchange-Coupled Nano-dots using the Magneto-optic Kerr Effect Technique

Hernandez, Sarah Christine
http://rave.ohiolink.edu/etdc/view?acc_num=miami1249430747

Abstract Details

2009, Master of Science, Miami University, Physics.
The effect of inter-dot exchange coupling on the magnetization reversal processes in nano- dots has been investigated on Permalloy dot arrays with dot diameters of 300 nm and thickness of 40 nm. The dots are exchange coupled via 50 nm long Permalloy bridges of width ranging from zero to 60 nm. Chains of five co-linear coupled dots form the unit cell of the array structure. Magneto-optical Kerr effect hysteresis loops are reported with comparison to simulations. With field applied along the coupling direction, nucleation is suppressed by the interdot exchange coupling resulting in highly correlated magnetization patterns. When the field is applied perpendicular-to-the-coupling direction, the exchange interaction has little effect and magnetic reversal is almost identical to arrays of isolated dots. As a result of rotating the applied magnetic field relative to the sample’s coupling direction, unusual hysteresis loops were observed, which could be explained by a combination of the x and y-component of the magnetization.
Michael Pechan, PhD (Advisor)
Khalid Eid, PhD (Committee Member)
Samir Bali, PhD (Committee Member)
73 p.
Physics
Permalloy nanodot; magnetic vortex; exchange coupling; MOKE; nucleation; annihilation; anisotropy; magnetostatics

Recommended Citations

Citations

  • Hernandez, S. C. (2009). IInvestigation of Magnetostatics of Exchange-Coupled Nano-dots using the Magneto-optic Kerr Effect Technique [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1249430747

    APA Style (7th edition)

  • Hernandez, Sarah. IInvestigation of Magnetostatics of Exchange-Coupled Nano-dots using the Magneto-optic Kerr Effect Technique. 2009. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1249430747.

    MLA Style (8th edition)

  • Hernandez, Sarah. "IInvestigation of Magnetostatics of Exchange-Coupled Nano-dots using the Magneto-optic Kerr Effect Technique." Master's thesis, Miami University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=miami1249430747

    Chicago Manual of Style (17th edition)

miami1249430747
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© 2009, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.