Abstract
Magnon-tuning non-volatile magnetic dynamics is investigated in a CoZr/PMN-PT structure by measuring ferromagnetic resonance at room temperature. The electric-field control of ferromagnetic resonance shows loop-like behavior, which indicates non-volatile electric-field control of the magnetism. Further, fitting the curves of in-plane rotating angle versus ferromagnetic resonance field under different electric fields shows that the effective magnetic field changes in loop-like manner with the electric field. The resulting change in non-volatile saturation magnetization with electric field is consistent with that of a polarization electric field curve. A 1.04% change of saturation magnetization is obtained, which can be attributed to a magnon-driven magnetoelectric coupling at the CoZr/PMN-PT interface. This magnon-driven magnetoelectric coupling and its dynamic magnetic properties are significant for developing future magnetoelectric devices.
Highlights
Controlling the electric field in magnetism has the potential to boost spintronics in ferromagnetic/ferroelectric (FM/FE) multiferroic heterostructures[1,2]
We have reported magnon-tuning non-volatile magnetic dynamics in a CoZr/PMN-PT structure
A loop-like curve was obtained for the resonance field versus electric field, exhibiting non-volatile behavior
Summary
Controlling the electric field in magnetism has the potential to boost spintronics in ferromagnetic/ferroelectric (FM/FE) multiferroic heterostructures[1,2]. A local nonuniform spiral spin density builds up at the interface because the spin-polarization screening charge is surface confined, leading to an initial uniform magnetization away from the interface This produces a strong and linear magnetoelectric (ME) coupling that is noticeable near the itinerant FM interface. The range of spiral spin density can reach the order of nanometers, which has a clear advantage in allowing non-volatile device for information storage This can be viewed as magnonic accumulation that is stabilized by the charge rearrangement between the coupled FE (with an FE polarization P) and FM (with an FM magnetization M)[14,15,16,17,18,19,20]. The magnon control of magnetic dynamics in a CoZr/PMN-PT structure is investigated by measuring ferromagnetic resonance (FMR) at room temperature
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