http://www.cnr.it/ontology/cnr/individuo/prodotto/ID282501
From micro- to nano- magnetic dots: evolution of the eigenmodes spectrum on reducing the lateral size (Articolo in rivista)
- Type
- Label
- From micro- to nano- magnetic dots: evolution of the eigenmodes spectrum on reducing the lateral size (Articolo in rivista) (literal)
- Anno
- 2014-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1088/0022-3727/47/26/265001 (literal)
- Alternative label
G Carlotti1,2, G Gubbiotti3, M Madami1, S Tacchi3, F Hartmann4,
M Emmerling4, M Kamp4 and L Worschech4 (2014)
From micro- to nano- magnetic dots: evolution of the eigenmodes spectrum on reducing the lateral size
in Journal of physics. D, Applied physics (Online)
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- G Carlotti1,2, G Gubbiotti3, M Madami1, S Tacchi3, F Hartmann4,
M Emmerling4, M Kamp4 and L Worschech4 (literal)
- Pagina inizio
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Rivista
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- Note
- ISI Web of Science (WOS) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- 1 CNISM-Dipartimento di Fisica, Universit`a di Perugia, Via A Pascoli, I-06123 Perugia, Italy
2 Centro S3, c/o Istituto Nanoscienze del CNR (CNR-NANO), I-41125 Modena, Italy
3 Istituto Officina dei Materiali del CNR (CNR-IOM), Unita' di Perugia, c/o Dipartimento di Fisica, Via
A Pascoli, I-06123 Perugia, Italy
4 Technische Physik, Physikalisches Institut, Universit¨at W¨urzburg and Wilhelm Conrad R¨ontgen
Research Center for Complex Material Systems, Am Hubland, D-97074 W¨urzburg, Germany (literal)
- Titolo
- From micro- to nano- magnetic dots: evolution of the eigenmodes spectrum on reducing the lateral size (literal)
- Abstract
- Brillouin light scattering experiments and micromagnetic simulations have been exploited to
investigate the spectrum of thermally excited magnetic eigenmodes in 10 nm-thick elliptical
Permalloy dots, when the longer axis D is scaled down from about 1000 to 100 nm. It is
shown that for D larger than about 200 nm the characteristics of the spin-wave eigenmodes are
dominated by dipolar energy, while for D in the range of about 100 to 200 nm exchange
energy effects cause qualitative and quantitative differences in the spin-wave spectrum. In this
'mesoscopic' regime, the usual classification scheme, involving one fundamental mode with
large average magnetization and many other modes collected in families with specific
symmetries, no longer holds. Rather, one finds the simultaneous presence of two modes with
'fundamental' character, i.e. with a significant and comparable value of the average dynamical
magnetization: the former is at larger frequency and has its maximum amplitude at the dot's
centre, while the latter occurs at lower frequency and is localized at the dot's edges.
Interestingly, the maximum intensity swaps from the higher frequency mode to the lower
frequency one, just when the dot size is reduced from about 200 to 100 nm. This is relevant in
view of the exploitation of nanodots for the design of nanomagnetic devices with lateral
dimensions in the above interval, such as memory cells, logic gates, reading heads and
spin-torque oscillators. (literal)
- Autore CNR
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