Magnetic and structural studies of core/shell manganese oxide nanoparticles fabricated by inert gas condensation
| Author(s) | Bah, Mohamed | |
| Date Accessioned | 2014-05-23T12:21:08Z | |
| Date Available | 2014-05-23T12:21:08Z | |
| Publication Date | 2013 | |
| Abstract | Manganese oxide core/shell nanoparticles were prepared in an inert gas condensation system. X-ray Diffraction (XRD) and High Resolution Transmission Electron Microscopy (HRTEM) studies revealed that the core consisted mainly of MnO which is ferromagnetic (FM) whereas the shell is a mixture of Mn2O3 and Mn3O4, both ferrimagnetic (FiM), with bulk Curie temperature (TC) of 39 K and 42 K, respectively. This results in an inverted core/shell structure. Both of these characteristic temperatures were found to be higher than their bulk counterpart, with TC = 46K and Néel temperature (TN) =150K. A high coercivity field (HC) of 20 kOe and an exchange bias field (HEB) of 200 Oe were observed from the magnetization measurements performed using a physical property measurement system (PPMS). High saturation magnetization, 10.67 emu/g, persistent magnetic moment above the TN presumably originating from the short-range spin correlation and other unusual behavior of the exchange bias (EB) and hysteresis loop are observed. | en_US |
| Advisor | Shah, Syed | |
| Degree | M.S. | |
| Department | University of Delaware, Department of Materials Science and Engineering | |
| URL | http://udspace.udel.edu/handle/19716/12986 | |
| Publisher | University of Delaware | en_US |
| dc.subject.lcsh | Gases, Rare. | |
| dc.subject.lcsh | Manganese oxides -- Magnetic properties. . | |
| dc.subject.lcsh | Nanoparticles -- Magnetic properties. | |
| dc.subject.lcsh | Condensation. | |
| Title | Magnetic and structural studies of core/shell manganese oxide nanoparticles fabricated by inert gas condensation | en_US |
| Type | Thesis | en_US |