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Preparation and quantitative magnetic studies of single-domain nickel cylinders

O'Barr, R. and Lederman, M. and Schultz, S. and Xu, Weihua and Scherer, A. and Tonucci, R. J. (1996) Preparation and quantitative magnetic studies of single-domain nickel cylinders. Journal of Applied Physics, 79 (8). pp. 5303-5305. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:OBAjap96

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Abstract

For a complete experimental and theoretical explanation of the magnetic processes in an interacting collection of submicron magnetic particles, a fundamental understanding of the magnetic properties of individual single-domain particles must first be achieved. We have prepared elongated Ni columns ranging in diameter from 0.15 to 1.0 µm by electroplating into specially prepared Al2O3 and glass channeled pore membranes. We have also prepared controlled arrays of Ni columns using e-beam lithography, subsequently electroplating into the written patterns. Using transmission electron microscopy, we have characterized the shape, size, morphology, and crystal structure of the columns. Magnetic force microscopy has been used to determine the switching field Hs versus the applied field angle of the columns. Although the switching field data can be fit to the functional form for nucleation by curling in an infinite cylinder, the observed weak dependence of Hs on column diameter is inconsistent with that expected for curling, particularly for columns of diameter 0.3 µm.


Item Type:Article
Additional Information:Copyright © 2006 American Institute of Physics Work was sponsored by the Center for Magnetic Recording Research, NSF Grant No. DMR-94-00439 (MRSEC),and ARPA/ETP.
Subject Keywords:NICKEL; MICROPARTICLES; ELECTROPLATING; LITHOGRAPHY; MORPHOLOGY; CRYSTAL STRUCTURE; DOMAIN STRUCTURE; MAGNETIZATION; INTERACTIONS
Record Number:CaltechAUTHORS:OBAjap96
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:OBAjap96
Alternative URL:http://dx.doi.org/10.1063/1.361359
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3521
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:12 Jun 2006
Last Modified:26 Dec 2012 08:54

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