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dc.contributor.authorVomir, Mircea
dc.contributor.authorTurnbull, Robin
dc.contributor.authorBirced, Ipek
dc.contributor.authorParreira, Pedro
dc.contributor.authorMacLaren, Donald A
dc.contributor.authorLee, Stephen Leslie
dc.contributor.authorAndré, Pascal
dc.contributor.authorBigot, Jean-Yves
dc.date.accessioned2016-08-12T11:30:12Z
dc.date.available2016-08-12T11:30:12Z
dc.date.issued2016-08-10
dc.identifier.citationVomir , M , Turnbull , R , Birced , I , Parreira , P , MacLaren , D A , Lee , S L , André , P & Bigot , J-Y 2016 , ' Dynamical torque in Co x Fe 3–x O 4 nanocube thin films characterized by femtosecond magneto-optics : a π-shift control of the magnetization precession ' , Nano Letters , vol. 16 , no. 8 , pp. 5291-5297 . https://doi.org/10.1021/acs.nanolett.6b02618en
dc.identifier.issn1530-6984
dc.identifier.otherPURE: 244719000
dc.identifier.otherPURE UUID: 9461b95b-bc08-47e2-915f-22c0b7ae4d78
dc.identifier.otherScopus: 84981295699
dc.identifier.otherORCID: /0000-0002-2020-3310/work/54995361
dc.identifier.otherWOS: 000381331900080
dc.identifier.urihttp://hdl.handle.net/10023/9293
dc.descriptionRT and PA would like to thank the Nuffield Foundation (ref. URB40673), the Physics Trust, and the Student Council of the School of Physics and Astronomy at St Andrews to support RT’s research internships. IB and PA acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC, ref. EP/H010033/1).en
dc.description.abstractFor spintronic devices excited by a sudden magnetic or optical perturbation, the torque acting on the magnetization plays a key role in its precession and damping. However the torque itself can be a dynamical quantity via the time dependent anisotropies of the system. A challenging problem for applications is then to disentangle the relative importance of various sources of anisotropies in the dynamical torque, such as the dipolar field, the crystal structure or the shape of the particular interacting magnetic nanostructures. Here, we take advantage of a range of colloidal cobalt ferrite nano-cubes assembled in 2D thin films under controlled magnetic fields to demonstrate that the phase φprec of the precession carries a strong signature of the dynamical anisotropies. Performing femtosecond magneto-optics, we show that φprec displays a π-shift for a particular angle θH of an external static magnetic field H. θH is controlled with the cobalt concentration, the laser intensity as well as the inter-particles interactions. Importantly it is shown that the shape anisotropy, which strongly departs from the one of equivalent bulk thin films or individual non-interacting nanoparticles, reveals the essential role played by the interparticles collective effects. This work shows the reliability of a non-invasive optical approach to characterize the dynamical torque in high density magnetic recording media made of organized and interacting nanoparticles.
dc.language.isoeng
dc.relation.ispartofNano Lettersen
dc.rightsACS AuthorChoice - This is an open access article published under a Creative Commons Attribution (CC-BY) License, which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited.en
dc.subjectMagnetization dynamicsen
dc.subjectMagnetic torqueen
dc.subjectColloidal magnetic nanoparticlesen
dc.subjectFerrite nano-cubesen
dc.subject2D nanoparticle filmsen
dc.subjectUltrafast magneto-opticsen
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.subjectNDASen
dc.subject.lccQBen
dc.subject.lccQCen
dc.titleDynamical torque in CoxFe3–xO4 nanocube thin films characterized by femtosecond magneto-optics : a π-shift control of the magnetization precessionen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Condensed Matter Physicsen
dc.identifier.doihttps://doi.org/10.1021/acs.nanolett.6b02618
dc.description.statusPeer revieweden


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