For Tbx (Fe90 Co10) 100-x (40 nm) NiO (3.3 nm) multilayers with x=17 and 19, antiferromagnetic coupling is revealed by both in-plane and out-of-plane hysteresis loops at low temperatures. Magnetic perpendicular anisotropy and out-of-plane coercivity of multilayers are enhanced, in comparison to those of TbFeCo single layer films. The strength of the antiferromagnetic coupling, the perpendicular anisotropy, and out-of-plane coercivity are all reduced at high temperatures. These results can be ascribed to the weakening of antiferromagnetic ordering of NiO spins.
Bibliographical noteFunding Information:
This work was supported by the National Science Foundation of China Grant Nos. 10174014, 60271013, 60490290, 10021001, and 10321003, and the State Key Project of Fundamental Research Grant Nos. 2001CB610602 and 2002CB613504, Shanghai Nanotechnology Program Center (No. 0252nm004). J.D. and X.X.Z. thank the support of Hong Kong RGC (HKUST 6059/02E), H.S. thanks the JSNSF from Jiangsu Province.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)