title: Magnetic response of hybrid ferromagnetic and antiferromagnetic core-shell nanostructures.
abstract: The synthesis of FeTiO3-Ni(Ni80Fe20) core-shell nanostructures by a two-step method (sol-gel and DC electrodeposition) has been demonstrated. XRD analysis confirms the rhombohedral crystal structure of FeTiO3(FTO) with space group R3[combining macron]. Transmission electron microscopy clearly depicts better morphology of nanostructures with shell thicknesses of ∼25 nm. Room temperature magnetic measurements showed significant enhancement of magnetic anisotropy for the permalloy (Ni80Fe20)-FTO over Ni-FTO core-shell nanostructures. Low temperature magnetic measurements of permalloy-FeTiO3 core-shell structure indicated a strong exchange bias mechanism with magnetic coercivity below the antiferromagnetic Neel temperature (TN = 59 K). The exchange bias is attributed to the alignment of magnetic moments in the antiferromagnetic material at low temperature. Our scheme opens a path towards optimum automotive systems and wireless communications wherein broader bandwidths and smaller sizes are required.
authors.affiliation: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China. xfhan@iphy.ac.cn usman_cssp@yahoo.com.
authors.forename: U
authors.initials: U
authors.lastname: Khan
authors.forename: W J
authors.initials: WJ
authors.lastname: Li
authors.forename: N
authors.initials: N
authors.lastname: Adeela
authors.forename: M
authors.initials: M
authors.lastname: Irfan
authors.forename: K
authors.initials: K
authors.lastname: Javed
authors.forename: C H
authors.initials: CH
authors.lastname: Wan
authors.forename: S
authors.initials: S
authors.lastname: Riaz
authors.forename: X F
authors.initials: XF
authors.lastname: Han