Intrinsic magnetic anisotropy versus coupling in arrays of closely spaced circular Fe/GaAs(110) dots,patterned by focused ion beam |
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| Affiliation: | 1. INFM—Dipartimento di Fisica, Università di Perugia, Via A. Pascoli, 06123 Perugia, Italy;2. INFM—CRS S3, Dipartimento di Fisica, Via Campi 213/A, 41100 Modena, Italy;3. INFM—CRS SOFT, Università di Roma “La Sapienza,” 00185 Roma, Italy;4. INFM—Dipartimento di Fisica, Università di Ferrara, Via Paradiso 12, 44100 Ferrara, Italy;1. Faculty of Engineering, Benha University, 11241 Cairo, Egypt;2. Institut d’Electronique, de Microélectronique et de Nanotechnologie,UMR CNRS 8520, UFR de Physique, Université de Lille 1, 59655 Villeneuve d’Ascq Cédex, France;3. Instituto de Física, Universidad Autónoma de Puebla, Apartado Postal J-48, Puebla 72570, Mexico;1. CNISM, Unità di Perugia, Via A. Pascoli, I-06123 Perugia, Italy;2. Dipartimento di Fisica, Università di Perugia, Via A. Pascoli, 06123 Perugia, Italy;3. INFM-CNR Research Center S3, Via A. Pascoli, 06123 Perugia, Italy;4. Information Storage Materials Laboratory, Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore;5. Department of Physics, Oakland University, Rochester, MI 48309, USA;1. LASMEA, UMR CNRS/Université Blaise Pascal 6602, Campus des Cézeaux, 63177 Aubière Cedex, France;2. LPMC, Ecole Polytechnique, 91128 Palaiseau Cedex, France;1. Dipartimento di Fisica, Università di Perugia, Via Pascoli, 06123 Perugia, Italy;2. CNR-INFM SOFT National Research Center, I-00185 Roma, Italy;3. INFM-CNR Research Center S3 and Dipartimento di Fisica, Via A. Pascoli, I-06123 Perugia, Italy;4. Physikalische Chemie, Universität München–Butenandtstr. 5-13, D-81377 München, Germany;1. University of Lisbon, IDL, LATTEX, Portugal;2. Centro Interdisciplinar de Investigação Marinha e Ambiental, University of Porto, Portugal |
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| Abstract: | We present the results of a detailed magneto-optical Kerr effect and Brillouin light scattering investigation of an epitaxial Fe/GaAs(110) film, 9 nm thick, achieving a quantitative determination of its anisotropy constants. Starting from this film, three different arrays of circular dots with diameter of 200 nm and interdot spacings of 200, 60 and 30 nm, have been produced by focused ion beam patterning. The modification of both the magnetization curves and the spin wave spectrum of the patterned specimens are discussed in terms of structural imperfections, intrinsic magnetocrystalline anisotropy and interdot dipolar coupling. |
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