Academic Journals Database
Disseminating quality controlled scientific knowledge

Field Dependence of the Spin Relaxation Within a Film of Iron Oxide Nanocrystals Formed via Electrophoretic Deposition

ADD TO MY LIST
 
Author(s): Kavich DW | Hasan SA | Mahajan SV | Park J-H | Dickerson JH

Journal: Nanoscale Research Letters
ISSN 1931-7573

Volume: 5;
Issue: 10;
Start page: 1540;
Date: 2010;
Original page

Keywords: Electrophoretic deposition | Core–shell | Superparamagnetic | EPD | Iron oxide | Thin film

ABSTRACT
Abstract The thermal relaxation of macrospins in a strongly interacting thin film of spinel-phase iron oxide nanocrystals (NCs) is probed by vibrating sample magnetometry (VSM). Thin films are fabricated by depositing FeO/Fe3O4 core–shell NCs by electrophoretic deposition (EPD), followed by sintering at 400°C. Sintering transforms the core–shell structure to a uniform spinel phase, which effectively increases the magnetic moment per NC. Atomic force microscopy (AFM) confirms a large packing density and a reduced inter-particle separation in comparison with colloidal assemblies. At an applied field of 25 Oe, the superparamagnetic blocking temperature is TBSP ≈ 348 K, which is much larger than the Néel-Brown approximation of TBSP ≈ 210 K. The enhanced value of TBSP is attributed to strong dipole–dipole interactions and local exchange coupling between NCs. The field dependence of the blocking temperature, TBSP(H), is characterized by a monotonically decreasing function, which is in agreement with recent theoretical models of interacting macrospins.
Save time & money - Smart Internet Solutions     

Tango Jona
Tangokurs Rapperswil-Jona