Modulation of loop shift behavior by magnetic training for Co 58 Fe 5 Ni 10 Si 11 B 16 amorphous ribbons
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n Hea) Division of Functional Material Research, China Iron & Steel Research Institute Group, Beijing 100081, People’s Republic of China
Xiang Li School for Materials Science & Engineering, Beijing Institute of Technology, Beijing 100081, People’s Republic of China
Bo Li and Dong Liang Zhao Division of Functional Material Research, China Iron & Steel Research Institute Group, Beijing 100081, People’s Republic of China (Received 7 March 2011; accepted 3 November 2011)
The asymmetrical hysteresis loops of the longitudinal field annealed Co58Fe5Ni10Si11B16 amorphous ribbons were studied. Longitudinal magnetic training was deliberately performed on the annealed samples with exchange bias behavior. It was found that the shifted loops can be technically controlled by training the ribbons to modulate the abnormal magnetic features. The scanning probe microscope results reveal that the AC longitudinal magnetic training can decrease the vertical magnetic signal on the sample surface to a great extent. This skillful magnetic training method provides an approach to tailor the exchange bias behavior in the Co-based amorphous ribbons for potential applications.
I. INTRODUCTION
It is well known that the exchange bias (EB) behavior was first discovered by C.P. Bean and W.H. Meiklejohn in a Co/CoO system.1 Subsequently, many scientists spent their efforts exploring the origin of this interesting phenomenon.2–8 A general consensus is that the EB is the result of an interfacial coupling between ferromagnetic and antiferromagnetic (FM/AFM) spins around the interface in the system. Large amounts of investigations indicated that the roughness, thickness, and microstructure of interface in the FM/AFM systems can dramatically influence the EB behavior.3–5 Thus, much attention has been paid to these aspects since the EB stability in the FM/AFM systems became the key for the materials to develop in applications.6,9–12 Basically, the application of a magnetic field can change the size of magnetic domains in these FM/AFM systems, and Lai and coworkers indicated that the size of magnetic domains as well as the micrograins of AFM phase can limit EB field to a certain extent.6 There are many investigations about the influence of magnetic training on the EB behavior,2,9,12–14 by means a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2011.399 720
J. Mater. Res., Vol. 27, No. 4, Feb 28, 2012
of the reduplicate measurement of hysteresis loop for the same sample. It has been found that the EB field decreases with increasing loop measurement cycle number n as an empirical linear function of 1/n.2,13 The training effect became more considerable if the thickness of AFM layer is thinner.9,12 Further research verified the influence of the training field and its direction on the local domains configuration in Co/CoO bilayers.14 In brief, magnetic training operation is thought to be one of the best avenues to effectively tune the EB in magnetic multilayer systems by tailoring local domains configuration around the interfa
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