NDLI: Artificial tuning of magnetization reversal in nano-sized magnets

Content Provider	IEEE Xplore Digital Library
Author	Vavassori, P. Porro, J.M. Berger, A. Grimsditch, M. Metlushko, V. Ilic, B.
Copyright Year	2011
Description	Author affiliation: CIC nanoGUNE Consolider, 20018 Donostia-San Sebastián, Spain (Vavassori, P.; Porro, J.M.; Berger, A.; Grimsditch, M.) \|\| Department of Electrical and Computer Engineering, University of Illinois at Chicago, 60607, USA (Metlushko, V.) \|\| Cornell Nanofabrication Facility, Cornell University, Ithaca NY 14853, USA (Ilic, B.)
Abstract	A key issue in fundamental physics and technology is to understand and control the magnetization behaviour of nano-sized magnets. Applications in hard disk drives and magnetic random access memories require nanoscale magnetic elements with controlled magnetic properties to ensure that each element is single domain with magnetization along two stable directions. This Ising-like behavior is achieved by reducing the lateral size of a nanomagnet to a length-scale comparable to the domain wall width and via engineering of its anisotropy (both exploiting material intrinsic magnetocrystalline and shape induced effects). For the abovementioned applications of nanomagnets the challenge is generally to avoid magnetic dipole interactions between the individual elements in patterned arrays, because they are a limiting factor for the achievable data storage density. Contrary to these application related aspects, recent works showed how to take advantage of these otherwise undesirable dipolar interactions and to exploit them for providing interconnectivity in large arrays and networks of closely-spaced, dipole-coupled, single-domain nanomagnets. One example are networks of dipole-coupled nanomagnets designed to perform signal processing tasks as well as digital computation in nanomagnets logic devices [1, 2]. Nanomagnet logic devices might have promising applications in the future, these include intelligent magnetic field sensors, processing-in-memory-type architectures, or even a complex signal-processing unit, based entirely on magnetic field coupling. In this study, we demonstrate experimentally using longitudinal [3] and diffracted magneto-optical Kerr effect measurements[4] and confirmed by theoretical modeling that localized magnetic field sources can be used to actively induce and finely control the magnetization states and reversal paths of nanomagnets beyond what achievable via lateral confinement and anisotropy engineering, and that such localized field sources can be easily facilitated within the appropriate array structure. For example, we show that subjecting a nanomagnets to a properly designed asymmetric and inhomogeneous dipolar near-field leads to a breakdown of the generally anticipated single-domain behavior, even for surprisingly small sizes of the nano-elements. Furthermore, we demonstrate that this breakdown is but one example of a more general physical concept determining the physics of artificial spin-ice structures, namely that the accommodation of frustration in systems with competing magnetic dipolar interactions involves the spin dynamic properties of each nano-magnet [5] and occurs already at fields well above the onset of magnetization reversal.
Starting Page	631
Ending Page	631
File Size	593889
Page Count	1
File Format	PDF
ISBN	9781612849768
e-ISBN	9781612849782
DOI	10.1109/ICEAA.2011.6046413
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-12
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic confinement Magnetic domains Magnetic domain walls Nanoscale devices Electronic mail Perpendicular magnetic anisotropy
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
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
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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