Efficient electrical control of magnetization switching and ferromagnetic resonance in flexible La0.7Sr0.3MnO3 films

Efficient electrical control of magnetic property is critical for the development of various spintronics. However, traditional magnetoelectric devices require adoption of piezoelectric component, resulting in complicated device architecture and complex conditioning circuit. More importantly, traditional strain-mediated magnetoelectric structures could not be developed in flexible form due to the existence of magnetostrictive component, which could be easily affected by mechanical deformation in flexible devices. Here we have systematically investigated pure current control of the magnetic properties of La0.7Sr0.3MnO3 thin films. Ferromagnetic to paramagnetic phase transition has been realized with a small current density of 5.2 × 103 A/cm2, which is three orders smaller than the working current density of spintronics based on spin-orbit torque and spin-transfer torque. The effective tuning of magnetic property has been attributed to the current induced Joule heating effect. For La0.7Sr0.3MnO3 film grown on flexible Mica with a smaller thermal conductivity, dramatic change of ferromagnetic resonance field of 1340 Oe and nonvolatile magnetization switching have been achieved with an ultra-small current density of 7.4 × 102 A/cm2. These results represent a crucial step towards effective electrical control of both static and dynamic magnetic properties in flexible magnetic thin films and open a new avenue for exploring electrical controlled flexible spintronics.