L1 0 -FeNi ordered phase in AC electrodeposited iron-nickel biphasic nanowires

MENESES, FERNANDO; PEDERNERA, ANALÍA; BLANCO, CECILIA; BAJALES, NOELIA; URRETA, SILVIA E.; BERCOFF, PAULA G.

JOURNAL OF ALLOYS AND COMPOUNDS

ELSEVIER SCIENCE SA

Año: 2018 vol. 766 p. 373 - 373

0925-8388

anowire arrays with nominal composition FexNi100-x (x = 0, 18, 53, 93, 100) have been synthesized by AC electrodeposition into the cylindrical pores of alumina templates. Except for the composition Fe53Ni47, nanowires are single-phase, consisting of small grains of the A1-FeNi disordered phase. Near the equiatomic nominal composition nanowires are biphasic, consisting of grains of the A1-FeNi disordered phase (g-FeNi phase) as well as grains of the L10-FeNi ordered phase (g´´-FeNi phase). Even in nanowires with high Fe content the a-Fe bcc phase is absent. The coercive field and reduced remanence dependences on composition are non monotonic but go through a local maximum near the equiatomic composition. Biphasic nanowires behave as a magnetic single phase, exhibiting a unique switching field for polarization reversal in the entire range between 5 K and 300 K. The linear dependence of the coercive field on temperature and the dependence of the coercive field on the angle between the na