Tunnel Magnetoresistance in Self-Assemblies of Exchange Coupled Core/Shell Nanoparticles

Abstract

We report the precise control of tunneling magnetoresistance (TMR) in devices of self-assembled core/shell Fe${}_3$O${}_4$/Co${}_{1-x}$Zn${}_x$Fe${}_2$O${}_4$ nanoparticles ($0\le x\le 1$). Adjusting the magnetic anisotropy through the content of Co${}^{2+}$ in the shell, provides an accurate tool to control the switching field between the bistable states of the TMR. In this way, different combinations of soft/hard and hard/soft core/shell configurations can be envisaged for optimizing devices with the required magnetotransport response.

25 pages, 7 figures

References in corpus (2)

• Applications of exchange coupled bi-magnetic hard/soft and soft/hard magnetic core/shell nanoparticles
• Sequential tunneling and inelastic cotunneling in nanoparticle arrays