Structural and magnetic properties of core–shell iron–iron oxide nanoparticles
We present studies of the structural and magnetic properties of core-shell iron-iron oxide nanoparticles. alpha -Fe nanoparticles were fabricated by sputtering and subsequently covered with a protective nanocrystalline oxide shell consisting of either maghaemite ( gamma -Fe sub 2 O sub 3 ) or partia...
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| Published in | Journal of physics. Condensed matter Vol. 14; no. 49; pp. 13551 - 13567 |
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| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Bristol
IOP Publishing
16.12.2002
Institute of Physics |
| Subjects | |
| Online Access | Get full text |
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| Abstract | We present studies of the structural and magnetic properties of core-shell iron-iron oxide nanoparticles. alpha -Fe nanoparticles were fabricated by sputtering and subsequently covered with a protective nanocrystalline oxide shell consisting of either maghaemite ( gamma -Fe sub 2 O sub 3 ) or partially oxidized magnetite (Fe sub 3 O sub 4 ). We observed that the nanoparticles were stable against further oxidation, and Mossbauer spectroscopy at high applied magnetic fields and low temperatures revealed a stable form of partly oxidized magnetite. The nanocrystalline structure of the oxide shell results in strong canting of the spin structure in the oxide shell, which thereby modifies the magnetic properties of the core-shell nanoparticles. |
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| AbstractList | We present studies of the structural and magnetic properties of core-shell iron-iron oxide nanoparticles. alpha -Fe nanoparticles were fabricated by sputtering and subsequently covered with a protective nanocrystalline oxide shell consisting of either maghaemite ( gamma -Fe sub 2 O sub 3 ) or partially oxidized magnetite (Fe sub 3 O sub 4 ). We observed that the nanoparticles were stable against further oxidation, and Mossbauer spectroscopy at high applied magnetic fields and low temperatures revealed a stable form of partly oxidized magnetite. The nanocrystalline structure of the oxide shell results in strong canting of the spin structure in the oxide shell, which thereby modifies the magnetic properties of the core-shell nanoparticles. |
| Author | Kuhn, L Theil Bojesen, A Mørup, S Timmermann, L Nielsen, M Meedom |
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| Keywords | Moessbauer effect Inorganic compounds Transition element compounds Experimental study Nanoparticles Magnetite Canted spin arrangements High field Magnetic structure Oxidation Sputter deposition Iron oxides Demagnetization Nanocrystal Crystal structure |
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| References_xml | – volume: 31 start-page: 2540 issn: 0021-4922 year: 1992 ident: 7 publication-title: Japan. J. Appl. Phys. doi: 10.1143/JJAP.31.2540 contributor: fullname: Tamura I – ident: 3 doi: 10.1016/S0304-8853(98)00249-2 – ident: 32 doi: 10.1023/A:1012603603203 – ident: 19 doi: 10.1103/PhysRevLett.27.1140 – year: 2001 ident: 29 contributor: fullname: Gerward L – volume: 10 start-page: 259 issn: 1434-6060 year: 2000 ident: 25 publication-title: Eur. Phys. J. doi: 10.1007/s100530050547 contributor: fullname: Kuhn L T – ident: 9 doi: 10.1103/PhysRevLett.72.282 – volume: 200 start-page: 732 issn: 0018-9464 year: 1986 ident: 5 publication-title: IEEE Trans. Magn. doi: 10.1109/TMAG.1986.1064554 contributor: fullname: Kishimoto M – start-page: 81 year: 1994 ident: 10 contributor: fullname: Sethi S A – ident: 4 doi: 10.1016/0039-6028(78)90142-5 – volume: 60 start-page: 3241 year: 1987 ident: 6 publication-title: Bull. Chem. Soc. Japan doi: 10.1246/bcsj.60.3241 contributor: fullname: Maeda Y – ident: 24 doi: 10.1023/A:1012643326691 – ident: 14 doi: 10.1016/S0304-8853(96)00457-X – volume: 9 start-page: 5461 issn: 0953-8984 year: 1997 ident: 22 publication-title: J. Phys.: Condens. Matter doi: 10.1088/0953-8984/9/25/013 contributor: fullname: Morales M P – ident: 23 doi: 10.1016/S0038-1098(01)00150-8 – volume: 41 start-page: C1 issn: 0305-4470 year: 1980 ident: 33 publication-title: J. Physique doi: 10.1051/jphys:019800041010100 contributor: fullname: Knudsen J E – year: 2000 ident: 2 contributor: fullname: O'Handley R – ident: 30 doi: 10.1016/S0304-8853(00)00369-3 – volume: 65 start-page: 1210 issn: 0008-4204 year: 1987 ident: 21 publication-title: Can. J. Phys. doi: 10.1139/p87-197 contributor: fullname: Coey J M D – volume: 30 start-page: 3142 issn: 0022-2461 year: 1995 ident: 11 publication-title: J. Mater. Sci. doi: 10.1007/BF01209229 contributor: fullname: Linderoth S – ident: 31 doi: 10.1023/A:1012649532742 – year: 1999 ident: 26 contributor: fullname: Kuhn L T – ident: 13 doi: 10.1063/1.361572 – ident: 16 doi: 10.1016/S0304-8853(00)00417-0 – issn: 0031-9007 year: 1972 ident: 1 contributor: fullname: Cullity B D – ident: 15 doi: 10.1103/PhysRevB.61.15284 – ident: 17 doi: 10.1063/1.1333401 – ident: 20 doi: 10.1016/0304-8853(83)90468-7 – ident: 8 doi: 10.1063/1.354456 – ident: 12 doi: 10.1063/1.359166 – ident: 18 doi: 10.1016/0304-8853(83)90753-9 – volume: 14 start-page: 415 issn: 0340-3793 year: 1977 ident: 34 publication-title: Appl. Phys. doi: 10.1007/BF00883449 contributor: fullname: von Eynatten G – ident: 27 – year: 1990 ident: 28 contributor: fullname: Warren B E |
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| Title | Structural and magnetic properties of core–shell iron–iron oxide nanoparticles |
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