MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES
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| Language: | English |
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Miami University / OhioLINK
2013
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=miami1376500586 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-miami13765005862021-08-03T06:19:10Z MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES Stanley, Daniel C. Physics Magnetite Magnetic Resonance Spin injected currents Thin films Magnetism The temperature dependence of damping in epitaxial Fe3O4/Ag bilayers grown on [001] MgO substrates was measured by Ag thickness. The Fe3O4 was deposited to 350 nm while the Ag thickness ranged from 0 to 500 nm. Measurements using ferromagnetic resonance (FMR) at 9.5 GHz with the sample film normal to the applied magnetic field were taken over a temperature range of 80 to 295 K. In-plane FMR was also done at 35GHz to determine the anisotropy. From these measurements the effective magnetization was calculated and with it the anisotropy parameters K4 and Ku. The samples exhibited easy-plane anisotropy consistent with thin-film effects. Line widths did not change substantially until the Verway transition (TV ~ 110 K), after which the damping increases dramatically at lower temperatures. This phenomenon will be discussed in terms of spin pumping into the Ag in conjunction with the properties of Fe3O4 changing at the Verway transition. 2013-08-20 English text Miami University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=miami1376500586 http://rave.ohiolink.edu/etdc/view?acc_num=miami1376500586 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Physics Magnetite Magnetic Resonance Spin injected currents Thin films Magnetism |
| spellingShingle |
Physics Magnetite Magnetic Resonance Spin injected currents Thin films Magnetism Stanley, Daniel C. MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| author |
Stanley, Daniel C. |
| author_facet |
Stanley, Daniel C. |
| author_sort |
Stanley, Daniel C. |
| title |
MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| title_short |
MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| title_full |
MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| title_fullStr |
MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| title_full_unstemmed |
MAGNETIC DAMPING IN FE3O4 THROUGH THE VERWEY TRANSITION FOR VARIABLE AG THICKNESSES |
| title_sort |
magnetic damping in fe3o4 through the verwey transition for variable ag thicknesses |
| publisher |
Miami University / OhioLINK |
| publishDate |
2013 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=miami1376500586 |
| work_keys_str_mv |
AT stanleydanielc magneticdampinginfe3o4throughtheverweytransitionforvariableagthicknesses |
| _version_ |
1719434620697575424 |