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15 p, 924.6 KB |
Polarizability and magnetoplasmonic properties of magnetic general nanoellipsoids
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Maccaferri, Nicolò (CIC nanoGUNE Consolider. Nanomagnetism Group) ;
González-Díaz, Juan B. (CIC nanoGUNE Consolider. Nanomagnetism Group) ;
Bonetti, Stefano (SLAC National Accelerator Laboratory) ;
Berger, Andreas (CIC nanoGUNE Consolider. Nanomagnetism Group) ;
Kataja, Mikko (Aalto-yliopiston teknillinen korkeakoulu. Teknillisen fysiikan laitos. NanoSpin) ;
Van Dijken, Sebastiaan (Aalto-yliopiston teknillinen korkeakoulu. Teknillisen fysiikan laitos. NanoSpin) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ;
Bonanni, Valentina (Istituto di Scienze e Tecnologie Molecolari) ;
Pirzadeh, Zhaleh (Chalmers tekniska högskola. Institutionen för teknisk fysik) ;
Dmitriev, Alexandre (Chalmers tekniska högskola. Institutionen för teknisk fysik) ;
Åkerman, Johan (Kungl. Tekniska högskolann. Materialfysik) ;
Vavassori, Paolo (Ikerbasque)
An approach to compute the polarizability tensor of magnetic nanoparticles having general ellipsoidal shape is presented. We find a surprisingly excellent quantitative agreement between calculated and experimental magneto-optical spectra measured in the polar Kerr configuration from nickel nanodisks of large size (exceeding 100 nm) with circular and elliptical shape. [...]
2013 -  10.1364/OE.21.009875
Optics express, Vol. 21, Núm. 8 (April 2013) , p. 9875-9889
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3 p, 1.3 MB |
Correlating material-specific layers and magnetic distributions within onion-like Fe 3 O 4 /MnO/ γ- Mn2 O3 core/shell nanoparticles
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Krycka, K. L. (NIST Center for Neutron Research) ;
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física) ;
Borchers, J. A. (NIST Center for Neutron Research) ;
Laver, M. (Paul Scherrer Institut (Suïssa)) ;
Salazar Álvarez, Germán (Stockholms universitet. Department of Materials and Environmental Chemistry) ;
López-Ortega, Alberto (Institut Català de Nanociència i Nanotecnologia) ;
Estrader, Marta (Stockholms universitet. Department of Materials and Environmental Chemistry) ;
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física) ;
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia)
The magnetic responses of two nanoparticle systems comprised of Fe3 O 4/γ−Mn2O3 (soft ferrimagnetic, FM/hard FM) and Fe3O4/MnO/γ−Mn2 O3 (soft FM / antiferromagnetic, AFM/hard FM) are compared, where the MnO serves to physically decouple the FM layers. [...]
2013 - 10.1063/1.4801423
Journal of applied physics, Vol. 113, Núm. 17 (May 2013) , p. B531-B533
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4 p, 822.3 KB |
Nanostructured MnGa films on Si/SiO2 with 20.5 kOe room temperature coercivity
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Zha, Chaolin (Kungl. Tekniska högskolann. Materialfysik) ;
Dumas, Randy K. (University of Gothenburg. Department of Physic) ;
Lau, J. W. (National Institute of Standards and Technology (U.S.). Metallurgy Division) ;
Mohseni, S. M. (Kungl. Tekniska högskolann. Materialfysik) ;
Sani, Sohrab R. (Kungl. Tekniska högskolann. Materialfysik) ;
Golosovsky, I. V. (Peterburgskiĭ institut i︠a︡dernoĭ fiziki im. B.P. Konstantinova.) ;
Monsen, A. F. (Norges Teknisk-Naturvitenskapelige Universitet. Department of Physics) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ;
Åkerman, Johan (Kungl. Tekniska högskolann. Materialfysik)
Nanostructured Mn67Ga33 films exhibiting high room temperature coercivity (HC = 20. 5 kOe) have been prepared by sputtering onto thermally oxidized Si substrates. Both the morphology and the coercivity of the films can be tuned by varying the growth parameters. [...]
2011 - 10.1063/1.3656457
Journal of applied physics, Vol. 110, Núm. 9 (Nov. 2011) , p. 093902/1-093902/4
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7 p, 2.5 MB |
Tuneable magnetic patterning of paramagnetic Fe60Al40 (at. %) by consecutive ion irradiation through pre-lithographed shadow masks
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Varea Espelt, Aïda (Universitat Autònoma de Barcelona. Departament de Física) ;
Suriñach, Santiago (Suriñach Cornet) (Universitat Autònoma de Barcelona. Departament de Física) ;
Menéndez Dalmau, Enric (Universitat Autònoma de Barcelona. Departament de Física) ;
Montserrat, J. (Centro Nacional de Microelectrónica) ;
Lora-Tamayo d'Ocón, Emilio (Centro Nacional de Microelectrónica) ;
Weber, A. (Paul Scherrer Institut (Suïssa)) ;
Heyderman, L. J. (Paul Scherrer Institut (Suïssa)) ;
Deevi, S. C. (Philip Morris. Research Center) ;
Rao, K. V. (Kungl. Tekniska högskolann. Materialfysik) ;
Baró, M. D.. (Universitat Autònoma de Barcelona. Departament de Física) ;
Buchanan, K. S. (Colorado State University. Department of Physics) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ;
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Arrays of ferromagnetic circular dots (with diameters ranging from 225 to 420 nm) have been prepared at the surface of atomically ordered paramagnetic Fe60Al40 (at. %) sheets by means of ion irradiation through prelithographed poly(methyl methacrylate) (PMMA) masks. [...]
2011 - 10.1063/1.3590158
Journal of applied physics, Vol. 109, Núm. 9 (May 2011) , p. 093918/1-093918/7
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3 p, 409.4 KB |
Continuously graded anisotropy in single (Fe53Pt47)100−xCux films
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Zha, Chaolin (Kungl. Tekniska högskolann. Materialfysik) ;
Dumas, Randy K. (University of Gothenburg. Department of Physic) ;
Fang, Yeyu (Kungl. Tekniska högskolann. Materialfysik) ;
Bonanni, Valentina (Kungl. Tekniska högskolann. Materialfysik) ;
Nogués, Josep (Institut Català de Nanociència i Nanotecnologia) ;
Aakerman, Johan (Kungl. Tekniska högskolann. Materialfysik) ;
American Physical Society
We report on continuously graded anisotropy. During deposition, a compositional gradient is achieved by varying the Cu concentration from Cu-rich (Fe53Pt47)70Cu30 to Cu-free Fe53Pt47. The anisotropy gradient is then realized after annealing using the composition dependence of the low-anisotropy (A1) to high-anisotropy (L10) ordering temperature. [...]
2010 - 10.1063/1.3505521
Applied physics letters, Vol. 97, Issue 18 (November 2010) , p. 182504/1-182504/3
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10 p, 380.8 KB |
Calibration of low-temperature ac susceptometers with a copper cylinder standard
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Chen, Du-Xing (Universitat Autònoma de Barcelona. Departament de Física) ;
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física)
A high-quality low-temperature ac susceptometer is calibrated by comparing the measured ac susceptibility of a copper cylinder with its eddy-current ac susceptibility accurately calculated. Different from conventional calibration techniques that compare the measured results with the known property of a standard sample at certain fixed temperature T, field amplitude Hm, and frequency f, to get a magnitude correction factor, here, the electromagnetic properties of the copper cylinder are unknown and are determined during the calibration of the ac susceptometer in the entire T, Hm, and f range. [...]
2010 - 10.1063/1.3309779
Review of scientific instruments, Vol. 81, Núm. 2 (Feb. 2010) , p. 025104/1-025104/10
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7 p, 1.8 MB |
Strain-driven noncollinear magnetic ordering in orthorhombic epitaxial YMnO3
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Martí Rovirosa, Xavier (Institut de Ciència de Materials de Barcelona) ;
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física) ;
Laukhin, Vladimir (Institut de Ciència de Materials de Barcelona) ;
Bachelet, Romain (Institut de Ciència de Materials de Barcelona) ;
Ferrater Martorell, Cèsar (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
García-Cuenca Varona, María Victoria (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
Varela Fernández, Manuel, 1956- (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
Sánchez Barrera, Florencio (Institut de Ciència de Materials de Barcelona) ;
Fontcuberta, Josep (Institut de Ciència de Materials de Barcelona)
We show that using epitaxial strain and chemical pressure in orthorhombic YMnO3 and Co-substituted (YMn0. 95Co0. 05O3) thin films, a ferromagnetic response can be gradually introduced and tuned. These results, together with the measured anisotropy of the magnetic response, indicate that the unexpected observation of ferromagnetism in orthorhombic o-RMnO3 (R=Y,Ho,Tb,etc. [...]
2010 - 10.1063/1.3514575
Journal of applied physics, Vol. 108, Núm. 12 (Des. 2010) , p. 123917/1-123917/7
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3 p, 180.1 KB |
Emergence of ferromagnetism in antiferromagnetic TbMnO3 by epitaxial strain
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Martí Rovirosa, Xavier (Institut de Ciència de Materials de Barcelona) ;
Skumryev, Vassil (Universitat Autònoma de Barcelona. Departament de Física) ;
Ferrater Martorell, Cèsar (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
García-Cuenca Varona, María Victoria (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
Varela Fernández, Manuel, 1956- (Universitat de Barcelona. Departament de Física Aplicada i Òptica) ;
Sánchez Barrera, Florencio (Institut de Ciència de Materials de Barcelona) ;
Fontcuberta, Josep (Institut de Ciència de Materials de Barcelona) ;
American Physical Society
We show that in oxide thin films of spiral antiferromagnetic orthorhombic TbMnO3, ferromagnetism emerges resulting from epitaxially induced strain. The unit cell volume can be tuned (contracting up to a 2%) by varying thickness and deposition conditions; it is found that the ferromagnetic response correlates with the unit cell deformation. [...]
2010 - 10.1063/1.3443714
Applied physics letters, Vol. 96, Issue 22 (May 2010) , p. 222505/1-222505/3
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