Thickness Dependent Structure and Magnetic Properties in ⁵⁷Fe/Ti/Co Multilayers

Abstract

Structural and magnetic properties of57Fe/Ti/Co multilayers (MLs), prepared by Ion beam sputtering on Si substrate have been studied as a function of trilayers (TLs) thickness and modulation periods. X-ray reflectivity (XRR) shows the successful growth of high-quality layered structures along with up to 3rdorder Bragg peaks with distinct Kiessig oscillation. X-ray diffraction (XRD) and Mössbauer studies evidence the formation of different phases mainly at the interfaces. Soft magnetic properties with high saturation values (~800emu/cm3) and high anisotropy field (~20kOe) are observed in the room temperature magnetization curve. The in plane value of coercivities are 18Oe and 60Oe for the 12 and 24 TLs respectively while in the out-of plane direction it increases to nearly 8 and 12 times respectively. The 12 TLs sample shows the presence of two fold anisotropy whereas the 24 TLs sample shows an isotropic behaviour. Low temperature DC magnetization studies evidence the presence of weak antiferromagnetic coupling while the Kelly Henkel plots for these samples show that the dominant exchange interactions between the grains are ferromagnetic.

Magnetic behaviour of $$^{57}$$Fe/Co/Al multilayers deposited on a glass substrate

“…The maximum of saturation values (M s ) in the in-plane direction along the HA are 1038 and 1105 emu cm −3 , respectively, for the 20 and 40 TL samples, while the thickness of nonmagnetic Al is ∼28% of the total thickness in both samples. Almost all the magnetic moments in these TLs originate from the ferromagnetic Fe/Co layers and thus can be estimated using the following expression [11]:…”