In collaboration with Prof. Ph. Ghosez (U. Liege) and Dr. J. Íñiguez (CSIC, Barcelona) we have investigated magnetic and ferroelectric (multiferroic) superlattices (SL) of perovskites oxides. Using the most advanced ab initio techniques to treat non-collinear magnetism, we have demonstrated that ABO3/A’BO3 superlattices with a magnetic B atom exhibit hybrid improper ferroelectricity and weak ferromagnetism. We have shown that a change in polarization can switch the magnetization in (BiFeO3)1/(LaFeO3)1 SLs at room temperature [Phys. Rev. B 2013, 88, 060102(R)]. This is remarkable because most magnetoelectric effects are weak and visible only at very low temperature. Our result can be exploited in spintronic devices to build magnetically readable and electrically writable random access memories (M-RAM). Growth and characterization of SLs are performed by the groups of Prof. J.-M. Triscone and Prof. P. Paruch in Geneva.
- G. Rispens, B. Ziegler, Z. Zanolli, J. Íñiguez, Ph. Ghosez, P. Paruch
Phase diagram of BiFeO3-LaFeO3 superlattices studied by x-ray diffraction experiments and first-principles calculations
Phys. Rev. B 90, 104106 (2014)
- Z. Zanolli, J. C. Wojdeł, J. Íñiguez, and Ph. Ghosez
Electric control of the magnetization in BiFeO3/LaFeO3 superlattices
Phys. Rev. B 88, 060102(R) (2013)