Biphasic Fe-Rh nanowires synthesized by AC electrodeposition

J. RIVA; G. POZO LOPEZ; ADRIANA CONDÓ; M. S. VIQUEIRA; SILVIA URRETA; LUIS FABIETTI

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 688 p. 804 - 804

0925-8388

e and Fe90Rh10 (nominal) polycrystalline nanowire arrays, 20 nm in diameter and about 1e3 mm in length, are successfully synthesized by AC electrodeposition into the cylindrical pores of anodized aluminum oxide (AAO) nanotemplates. The effects of Rh addition to Fe nanowires on the resulting microstructure, magnetic hysteresis and magnetoresistance properties are explored. As deposited Fe90Rh10 nanowires are biphasic, with large aFe grains (>100 nm) and clusters of very small (1.7 nm) grains of the ClCs type a0 -FeRh phase, with a composition near Fe42Rh58. Hysteresis loops as a function of the sample orientation relative to the external applied field indicate that the easy magnetization axis is parallel to the nanowire long axis at all temperatures. The coercive field decreases with rhodiumaddition, as expected for an effective uniaxial anisotropy controlled by shape effects; on contrary, the relative remanence (or squareness) slightly increases. The temperature dependence of the coer