The Effect of Interface Texture on Exchange Biasing in Ni80Fe20/Ir20Mn80System

Nanoscale Research Letters

关键词: Exchange biasing;    Texture;    Coupling or decoupling effect;   

DOI  :  

来源: DOAJ

【 摘 要 】

Abstract

Exchange-biasing phenomenon can induce an evident unidirectional hysteresis loop shift by spin coupling effect in the ferromagnetic (FM)/antiferromagnetic (AFM) interface which can be applied in magnetoresistance random access memory (MRAM) and recording-head applications. However, magnetic properties are the most important to AFM texturing. In this work, top-configuration exchange-biasing NiFe/IrMn(x Å) systems have been investigated with three different conditions. From the high-resolution cross-sectional transmission electron microscopy (HR X-TEM) and X-ray diffraction results, we conclude that the IrMn (111) texture plays an important role in exchange-biasing field (H _ex) and interfacial exchange energy (J _k).H _exandJ _ktend to saturate when the IrMn thickness increases. Moreover, the coercivity (H _c) dependence on IrMn thickness is explained based on the coupling or decoupling effect between the spins of the NiFe and IrMn layers near the NiFe/IrMn interface. In this work, the optimal values forH _exandJ _kare 115 Oe and 0.062 erg/cm², respectively.

【 授权许可】

Unknown