Study of Exchange Bias in All Ferromagnetic Fe/Co Soft/Hard Bilayer

Author

Singh, Harshavardhan ; Gupta, Rajesh ; Chakraborty, Tamal ; Gupta, Arpan ; Mitra, Chiranjib

Author_Institution

Indian Inst. of Sci. Educ. & Res. Kolkata, Kolkata, India

Volume

50

Issue

9

fYear

2014

fDate

Sept. 2014

Firstpage

1

Lastpage

4

Abstract

We report the unusual and exotic phenomenon of positive exchange bias observed in all ferromagnetic layered soft/hard Fe/Co spring magnet systems. Interestingly, the results are well reproducible both at low (5 K) and room temperatures (300 K). The effect of applied magnetic pinning field of 7 and -5 T reveals a noticeable shift of magnetic hysteresis loops along the field direction. We argue that the reason behind observed positive exchange bias is the establishment of antiferromagnetic (AFM) exchange coupling at the interface as a result of intermixing of Fe into the Co layer. The collective coupling of this intermix layers is AFM which facilitates positive shift of magnetic hysteresis loop.

Keywords

antiferromagnetic materials; atomic force microscopy; cobalt; exchange interactions (electron); ferromagnetic materials; interface magnetism; iron; magnetic hysteresis; permanent magnets; soft magnetic materials; AFM; Fe intermixing; Fe-Co; antiferromagnetic exchange coupling; applied magnetic pinning field effect; collective coupling; ferromagnetic Fe-Co soft-hard bilayer; ferromagnetic layered soft-hard Fe-Co spring magnet systems; field direction; intermix layers; magnetic hysteresis loop shift; positive exchange bias; temperature 300 K; temperature 5 K; Couplings; Iron; Magnetic field measurement; Magnetic hysteresis; Perpendicular magnetic anisotropy; Temperature measurement; Antiferromagnetic (AFM) materials; magnetic films; magnetization; sputtering;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2014.2313590

Filename

6779623