Geometrical control of the magnetization direction in high-aspect ratio PdNi ferromagnetic nano-electrodes

Abstract

I present a detailed study of the magnetic propertie of electron-beam evaporated Pdo.4Nio.6 alloy thin films by means of ferromagnetic resonance measurements on extended films of varying thickness and anisotropic magnetoresistance measurements lithographically patterned high aspect-ratio ferromagnetic electrodes, respectively. The results reveal that the direction of the magnetization with respect to the film plane strongly depends on the electrode lateral dimensions, transitioning from in-plane magnetization for extended films to out of the plane magnetization for electrode width below 2-3 microns, reaching ~58 degrees for electrode widths of about 100nm (nanowires). This behavior arises from a competition between the film demagnetizing vector, which leads to in-plane magnetization for extended films , and an intrinsic uniaxial anisotropy, which overcomes the magnetostatic energy for laterally constrained films, pulling the magnetization off plane.

Notes

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Thesis Completion

2008

Semester

Spring

Advisor

del Barco, Enrique

Degree

Bachelor of Science (B.S.)

College

College of Sciences

Degree Program

Physics

Subjects

Dissertations, Academic -- Sciences;Sciences -- Dissertations, Academic

Format

Print

Identifier

DP0022705

Language

English

Access Status

Open Access

Length of Campus-only Access

None

Document Type

Honors in the Major Thesis

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