REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

tHERMAL STABILITY AND MAGNETIC PROPERTIES OF ε-Fe₂O₃ POLYMORPh

vIOLETA N. NIKOLIĆ

Institute of  Nuclear Sciences Vinča, University of Belgrade, Mike Petrovića Alasa 12-14, P.O. Box 522, 11001 Belgrade, violeta@vinca.rs

marin tadić

Institute of  Nuclear Sciences Vinča, University of Belgrade, Mike Petrovića Alasa 12-14, P.O. Box 522, 11001 Belgrade, marint@vinca.rs

vojislav spasojević

Institute of  Nuclear Sciences Vinča, University of Belgrade, Mike Petrovića Alasa 12-14, P.O. Box 522, 11001 Belgrade, vojas@vinca.rs

Abstract: Based on its high room-temperature coercivity (H_c ̴ 20 kOe), high Curie temperature (T_c = 510 K), and magnetoelectric character, ε-Fe₂O₃ became a material of great interest for potential application in spintronic devices. This material can be used for construction of spintronic microwave diodes (SMD), important part of spintronic sensor system for detection and analysis of radar threats for ground combat vehicles. In this study, two samples consisted ε-Fe₂O₃ phase (11.6 and 14.1 wt% of Fe₂O₃), were prepared by sol-gel synthesis route. Synthesized materials were characterized by XRD and FTIR techniques. Magnetic investigation was done by SQUID magnetometer. AC and DC measurements, performed in order to investigate ε-Fe₂O₃ magnetic behavior, are discussed.

Keywords: ε-Fe₂O₃, sol-gel synthesis, characterization.