Electric-field control of magnetic domain wall motion and local magnetization dynamics in multiferroic heterostructures
CIC nanoGUNE Seminars
- Speaker
-
Sebastiaan van Dijken, Aalto University, Aalto, Finland
- When
-
2011/12/13
13:00 - Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
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Spintronic devices currently rely on magnetic switching or controlled motion
of domain walls by an external magnetic field or spin-polarized current.
Achieving the same degree of magnetic controllability using an electric field
has potential advantages including enhanced functionality and low power
consumption. In this presentation, I will discuss an approach to electrically
control local magnetic properties, including the writing and erasure of
regular ferromagnetic domain patterns and the motion of magnetic domain walls,
in multiferroic heterostructures [1-3]. The method is based on recurrent
strain transfer from ferroelastic domains in ferroelectric media to continuous
magnetostrictive films with negligible magnetocrystalline anisotropy. Optical
polarization microscopy images of both ferromagnetic and ferroelectric domain
structures reveal that domain correlations and strong inter-ferroic domain
wall pinning can be maintained in an applied electric field. This leads to an
unprecedented electric controllability over the ferromagnetic microstructure,
an accomplishment that produces giant magnetoelectric coupling effects and
opens the way to electric-field driven spintronics.
[1] T.H.E. Lahtinen, J.O. Tuomi, and S. van Dijken, Adv. Mater. 23, 3187
(2011)
[2] T.H.E. Lahtinen, J.O. Tuomi, and S. van Dijken, IEEE Trans. Magn. 47, 3768
(2011)
[3] T.H.E. Lahtinen, K.J.A. Franke, and S. van Dijken,
[arXiv:1109.5514v1](http://arxiv.org/abs/1109.5514v1)