http://www.cnr.it/ontology/cnr/individuo/prodotto/ID280642
Exchange-dominated eigenmodes in sub-100 nm permalloy dots: a micromagnetic study at finite temperature (Articolo in rivista)
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- Label
- Exchange-dominated eigenmodes in sub-100 nm permalloy dots: a micromagnetic study at finite temperature (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1063/1.4862844 (literal)
- Alternative label
G. Carlotti,1 G. Gubbiotti,2 M. Madami,1 S. Tacchi,2 and R.L. Stamps3 (2014)
Exchange-dominated eigenmodes in sub-100 nm permalloy dots: a micromagnetic study at finite temperature
in Journal of applied physics
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- G. Carlotti,1 G. Gubbiotti,2 M. Madami,1 S. Tacchi,2 and R.L. Stamps3 (literal)
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- http://dx.doi.org/10.1063/1.4862844 (literal)
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- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1CNISM, Unit?a di Perugia-Dipartimento di Fisica, Via A. Pascoli, I-06123 Perugia, Italy
2Istituto Officina dei materiali CNR-IOM, Unit?a di Perugia, c/o Dipartimento di Fisica, Via A. Pascoli,
I-06123 Perugia, Italy
3School of Physics and Astronomy, University of Glasgow, University Avenue, G12 QQ, Scotland, United Kingdom (literal)
- Titolo
- Exchange-dominated eigenmodes in sub-100 nm permalloy dots: a micromagnetic study at finite temperature (literal)
- Abstract
- Micromagnetic simulations at room temperature (300K) have been carried out in order to analyse the
magnetic eigenmodes (frequency and spatial profile) in elliptical dots with sub-100 nm lateral size.
Features are found that are qualitatively different from those typical of larger dots because of the
dominant role played by the exchange-energy. These features can be understood most simply in
terms of nodal planes defined relative to the orientation of the static magnetization. A new,
generalized labeling scheme is proposed that simplifies discussion and comparison of modes from
different geometries. It is shown that the lowest-frequency mode for small dots is characterized by an
in-phase precession of spins, without nodal planes, but with a maximum amplitude at the edges. This
mode softens at an applied switching field with magnitude comparable to the coercive field and
determines specific aspects of magnetization reversal. This characteristic behavior can be relevant for
optimization of microwave assisting switching as well as for maximizing interdot coupling in dense
arrays of dots (literal)
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