Neutron study of magnetic excitations in 8-nm {alpha}-Fe{sub 2}O{sub 3} nanoparticles
By use of inelastic neutron scattering we have studied magnetic fluctuations in 8-nm particles of antiferromagnetic {alpha}-Fe{sub 2}O{sub 3} (hematite) as a function of temperature and applied magnetic fields. The fluctuations are dominated by uniform excitations. Studies have been performed on bot...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2006-11, Vol.74 (18) |
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| container_title | Physical review. B, Condensed matter and materials physics |
| container_volume | 74 |
| creator | Theil Kuhn, L. Lefmann, K. Bahl, C. R. H. Ancona, S. Nyborg LindgA rd, P.-A. Frandsen, C. Madsen, D. E. Moerup, S. Department of Physics, Building 307, Technical University of Denmark, DK-2800 Kongens Lyngby |
| description | By use of inelastic neutron scattering we have studied magnetic fluctuations in 8-nm particles of antiferromagnetic {alpha}-Fe{sub 2}O{sub 3} (hematite) as a function of temperature and applied magnetic fields. The fluctuations are dominated by uniform excitations. Studies have been performed on both coated (noninteracting) and uncoated (interacting) particles. We have estimated the magnetic anisotropy energy and found that the data are in good agreement with the value obtained from Moessbauer spectroscopy. The energy {epsilon}{sub 0} of the uniform excitations depends strongly on the uncompensated moment, which is caused by finite-size effects, and we have estimated the size of this moment from the experimental neutron data. The field dependence of {epsilon}{sub 0} for the interacting nanoparticles differs strongly from that of the noninteracting nanoparticles, and this is a result of the influence of exchange interaction between the particles. |
| doi_str_mv | 10.1103/PHYSREVB.74.184406 |
| format | Article |
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The energy {epsilon}{sub 0} of the uniform excitations depends strongly on the uncompensated moment, which is caused by finite-size effects, and we have estimated the size of this moment from the experimental neutron data. The field dependence of {epsilon}{sub 0} for the interacting nanoparticles differs strongly from that of the noninteracting nanoparticles, and this is a result of the influence of exchange interaction between the particles.</description><identifier>ISSN: 1098-0121</identifier><identifier>EISSN: 1550-235X</identifier><identifier>DOI: 10.1103/PHYSREVB.74.184406</identifier><language>eng</language><publisher>United States</publisher><subject>ANISOTROPY ; ANTIFERROMAGNETIC MATERIALS ; ANTIFERROMAGNETISM ; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ; ELECTRONS ; EXCHANGE INTERACTIONS ; EXCITATION ; FLUCTUATIONS ; HEMATITE ; INELASTIC SCATTERING ; IRON OXIDES ; MAGNETIC FIELDS ; MATERIALS SCIENCE ; MOESSBAUER EFFECT ; NANOSTRUCTURES ; NEUTRON DIFFRACTION ; PARTICLES ; SPIN ; TEMPERATURE DEPENDENCE</subject><ispartof>Physical review. 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The energy {epsilon}{sub 0} of the uniform excitations depends strongly on the uncompensated moment, which is caused by finite-size effects, and we have estimated the size of this moment from the experimental neutron data. The field dependence of {epsilon}{sub 0} for the interacting nanoparticles differs strongly from that of the noninteracting nanoparticles, and this is a result of the influence of exchange interaction between the particles.</description><subject>ANISOTROPY</subject><subject>ANTIFERROMAGNETIC MATERIALS</subject><subject>ANTIFERROMAGNETISM</subject><subject>CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY</subject><subject>ELECTRONS</subject><subject>EXCHANGE INTERACTIONS</subject><subject>EXCITATION</subject><subject>FLUCTUATIONS</subject><subject>HEMATITE</subject><subject>INELASTIC SCATTERING</subject><subject>IRON OXIDES</subject><subject>MAGNETIC FIELDS</subject><subject>MATERIALS SCIENCE</subject><subject>MOESSBAUER EFFECT</subject><subject>NANOSTRUCTURES</subject><subject>NEUTRON DIFFRACTION</subject><subject>PARTICLES</subject><subject>SPIN</subject><subject>TEMPERATURE DEPENDENCE</subject><issn>1098-0121</issn><issn>1550-235X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqNjM1KAzEURoNYsGpfwNUF1xlvfsamW6WlKxX_aFclxtRGpjelNwNKmXd3EB_A1fkW5ztCXCislEJz9TBfPj1OX2-qsa2Usxavj8RQ1TVKberFcb9x4iQqrU7EKfMnorITq4fi5S62ZZ8JuLTv35DXsPUfFEsKEL9CKr6kTAyJwEnawsE3u43v5CweuH0D3d3_0nRAnvLO7_tjE_lcDNa-4Tj645m4nE2fb-cyc0kr7rsxbEImiqGsNLrauLE1_7N-AHD6SMM</recordid><startdate>20061101</startdate><enddate>20061101</enddate><creator>Theil Kuhn, L.</creator><creator>Lefmann, K.</creator><creator>Bahl, C. 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R. H.</creatorcontrib><creatorcontrib>Ancona, S. Nyborg</creatorcontrib><creatorcontrib>LindgA rd, P.-A.</creatorcontrib><creatorcontrib>Frandsen, C.</creatorcontrib><creatorcontrib>Madsen, D. E.</creatorcontrib><creatorcontrib>Moerup, S.</creatorcontrib><creatorcontrib>Department of Physics, Building 307, Technical University of Denmark, DK-2800 Kongens Lyngby</creatorcontrib><collection>OSTI.GOV</collection><jtitle>Physical review. B, Condensed matter and materials physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Theil Kuhn, L.</au><au>Lefmann, K.</au><au>Bahl, C. R. H.</au><au>Ancona, S. Nyborg</au><au>LindgA rd, P.-A.</au><au>Frandsen, C.</au><au>Madsen, D. 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We have estimated the magnetic anisotropy energy and found that the data are in good agreement with the value obtained from Moessbauer spectroscopy. The energy {epsilon}{sub 0} of the uniform excitations depends strongly on the uncompensated moment, which is caused by finite-size effects, and we have estimated the size of this moment from the experimental neutron data. The field dependence of {epsilon}{sub 0} for the interacting nanoparticles differs strongly from that of the noninteracting nanoparticles, and this is a result of the influence of exchange interaction between the particles.</abstract><cop>United States</cop><doi>10.1103/PHYSREVB.74.184406</doi></addata></record> |
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| ispartof | Physical review. B, Condensed matter and materials physics, 2006-11, Vol.74 (18) |
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| language | eng |
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| source | American Physical Society Journals |
| subjects | ANISOTROPY ANTIFERROMAGNETIC MATERIALS ANTIFERROMAGNETISM CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY ELECTRONS EXCHANGE INTERACTIONS EXCITATION FLUCTUATIONS HEMATITE INELASTIC SCATTERING IRON OXIDES MAGNETIC FIELDS MATERIALS SCIENCE MOESSBAUER EFFECT NANOSTRUCTURES NEUTRON DIFFRACTION PARTICLES SPIN TEMPERATURE DEPENDENCE |
| title | Neutron study of magnetic excitations in 8-nm {alpha}-Fe{sub 2}O{sub 3} nanoparticles |
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