Magnetic excitations at the Brillouin zone boundary in Mn (17%Fe, 3%Cu) alloy
| Autor: | Bernard Hennion, Joanna Jankowska-Kisielinska, Kazimierz Mikke |
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| Rok vydání: | 2004 |
| Předmět: |
Materials science
Condensed matter physics Scattering Alloy engineering.material Condensed Matter Physics Inelastic neutron scattering Electronic Optical and Magnetic Materials Brillouin zone Tetragonal crystal system Spin wave engineering Antiferromagnetism Electrical and Electronic Engineering Intensity (heat transfer) |
| Zdroj: | Physica B: Condensed Matter. 350:E79-E81 |
| ISSN: | 0921-4526 |
| DOI: | 10.1016/j.physb.2004.03.022 |
| Popis: | In tetragonal Mn (18%Cu) and Mn (13.7%Ni) alloys the low and medium energy excitations were observed previously near points at the magnetic Brillouin-zone (MBZ) boundary, geometrically equivalent to the MBZ centre. The properties of the inelastic neutron scattering (INS) on these excitations, e.g. the temperature dependence of its intensity, are different from those of spin waves observed near the MBZ centre. The nature of these excitations is not yet clearly understood. Here, the magnetic excitations at the MBZ boundary in the Mn (17%Fe, 3%Cu) alloy are investigated. In our sample, (68±8)% of the volume is occupied by domains with the c-axis oriented along one direction. The INS at the MBZ centre increases when the temperature is lowered. It is dominated by the spin waves but a small quasi-elastic scattering is also present. The INS intensity at the MBZ boundary shows a very weak temperature dependence. |
| Databáze: | OpenAIRE |
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