Principal Investigator :

Anne Bernand-Mantel ()
LPCNO (Theory)

Type of project : Disruptive Project

Partner team(s) :

CEMES

Date (start/end) : 2018 - 2020

     

   

Hybride device made of a 2D ferromagnetic layer in the form of a Hall cross and a nano/micromagnet (white sphere).

The magnetic properties of the nano/micromagnet is detected by the stray field which induced a spin texture inside the 2D ferromagnet.   

Abstract

Electric control of magnetism is a prerequisite for efficient and low power spintronic devices. More specifically, in heavy metal/ ferromagnet/ insulator heterostructures, voltage gating has been shown to locally and dynamically tune magnetic properties like interface anisotropy and saturation magnetization. As the electric field is rapidly screened in a metal, such effects are only expected in systems showing a large surface/volume ratio. We propose to probe the variation of magnetic nanoparticles properties in a gated Hall device geometry. In order to enhance the sensibility of the nanoparticles to the electric field we will work close to magnetic transitions (ferromagnetic/paramagnetic, ferromagnetic/superparamagnetic, ferromagnetic/antiferromagnetic,…). The additional degree of freedom provided by the electric field will lead to a better understanding of the role of interfaces in the magnetic properties of nano-objects. Potential applications for information technologies or sensors can be expected.

The main challenge of this measurement is to elaborate the hybrid 2D ferromagnet Hall cross /nano/micromagnet (Figure). This will be done using physical deposition of nanoparticle with a nanoparticle source (CEMES) or starting from nanoparticles surrounded by ligands (LPCNO). In case of success, we will obtain devices compatible with gating for magnetization control and which can be easily miniaturized down to the nanoscale using e-beam lithography.