Dresden 2009 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)
MA 40.54: Poster
Freitag, 27. März 2009, 11:00–14:00, P1A
Electric field-control of remanent magnetization in multifunctional hybrids — •Andreas Brandlmaier1, Matthias Brasse1, Matthias Opel1, Georg Woltersdorf2, Rudolf Gross1, and Sebastian T. B. Goennenwein1 — 1Walther-Meissner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching — 2Universität Regensburg, 93040 Regensburg
Multifunctional ferromagnetic/ferroelectric hybrid structures allow for novel magnetization control schemes. In particular, an electric field-control of remanent magnetization orientation becomes possible.
We have fabricated ferromagnetic/ferroelectric hybrids by evaporating ferromagnetic Ni thin films onto commercially available piezoelectric actuators. Due to magnetoelastic coupling, the expansion/contraction of the actuator as a function of the applied voltage Vp allows for a voltage-control of the magnetization orientation. In addition, because the expansion/contraction of the actuator is hysteretic itself, there are two different strain states at zero applied voltage leading to two different magnetization orientations.
Using magneto-optical Kerr effect and anisotropic magnetoresistance measurements, we study the magnetization orientation as a function of strain. We demonstrate that upon the application of an appropriate voltage sequence to the actuator, the magnetization at Vp=0 V can be deterministically switched between two distinct magnetization states without applying a magnetic field. This allows to realize an electrically controlled magnetic memory cell.
This work is supported by the DFG via SPP 1157 and GO 944/3.