NDLI: Nanostructured Hard Magnets: A Micromagnetic Study

Content Provider	IEEE Xplore Digital Library
Author	Toson, P. Asali, A. Wallisch, W. Zickler, G. Fidler, J.
Copyright Year	1965
Abstract	Hard magnetic nanostructures have several applications such as magnetic recording media, sensors, and microelectromechanical systems applications containing permanent magnets. In this paper, we performed micromagnetic simulations on Co nanorods on a regular grid and in an irregular packing. Both types of models describe structures which can be produced experimentally: regular grids of nanorods can be created by electro deposition in an alumina template and irregularly packed structures can be obtained by compacting nanorods synthesized in a polyol process. In addition, we also studied the increase of coercivity of capped Fe nanorods with an antiferromagnetic layer. The packed structures have been generated by a packing algorithm on the basis of gravity and collision forces and have a packing density of up to 58%. The simulations on the regular hexagonal grid of nanorods show that energy density products (BH)_max of up to 200 kJ/m³ can be reached with this packing density, but the calculations on irregularly packed structures exhibit only energy density products of up to 85 kJ/m³. The discrepancy can be explained by the misalignment of nanorods which reduces both coercive field and remanence of the structure. The antiferromagnetic caps on Fe nanorods suppress the formation of nucleation centers at the tips and increase the coercivity of the nanorod by 11% in the case of asymmetric hysteresis loops with hard caps (K_1,cap = 4.6 MJ/m³) and 25% in the case of symmetric hysteresis with softer caps (K_1,cap = 460 kJ/m³).
Sponsorship	IEEE Magnetics Society
Starting Page	1
Ending Page	4
Page Count	4
File Size	1485325
File Format	PDF
ISSN	00189464
Volume Number	51
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Coercive force Magnetic hysteresis Iron Micromagnetics Perpendicular magnetic anisotropy Magnetic recording micromagnetics Magnetic materials magnetic nanostructures
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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