Email this article ENHANCEMENT OF PERPENDICULAR EXCHANGE BIAS IN [Co/Pd]/IrMn SYSTEM BY ULTRATHIN CoFe INSERTION LAYER
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Received: 11/05/20 Revised: 30/05/20 Published: 31/05/20Authors
1. Nguyen Thi Thanh Thuy, Hanoi National University of Education2. Cao Thi Thanh Hai, Hanoi National University of Education
3. Nguyen Thi Hue, Hanoi National University of Education
4. Dinh Hung Manh, Hanoi National University of Education
5. Vu Hong Ky, Institute of Materials Science – VAST
6. Do Khanh Tung, Institute of Materials Science – VAST
7. Nguyen Thanh Huong, Institute of Materials Science – VAST
8. Nguyen Thi Ngoc Anh
, Institute of Materials Science – VAST,
Graduate University of Science and Technology - VAST
Abstract
In this study, we investiged the effect of an ultrathin CoFe insertion layer on perpendicular exchange bias in the [Co/Pd]/IrMn systems. These multilayers were deposited by magnetron sputtering. The structural and magnetic properties of the deposited multilayers were examined by X-ray diffractometer and Vibration sample magnetometer. The experimental results showed that the value of the perpendicular exchange bias field (HEB) of [Co/Pd]/IrMn multilayers at room temperature is relatively high (HEB ~ 98 Oe). However, HEB is significantly enhanced when an ultrathin layer of CoFe (tCoFe = 0.3 – 1.2 nm) is inserted between the [Co/Pd] ferromagnetic multilayers and the IrMn antiferromagnetic layer. The highest value of HEB is 205 Oe with tCoFe = 0.8 nm which is more than twice higher than that of the system without CoFe insertion layer.
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