HIGH-FREQUENCY MAGNETOCAPACITANCE EFFECT IN ORGANIC SPIN VALVE WITH A 3,4,9,10-PERYLENE-TERACARBOXYLIC-DIANHYDRIDE SPACER

The frequency-dependent impedance of a series of ferromagnet (FM)/organic semiconductor (OSC)/FM tri-layered organic spin valves (OSV) is investigated in the frequency range of 10 Hz–1 MHz. An equivalent resistor–capacitor (RC) parallel network model is employed to analyze the magnetoresistance (MR) and magnetocapacitance (MC) effects. Fitting with the model yields field-dependent parameters and the resistive parameters agree with the experimental results. The analysis of the impedance spectra indicates an effective magnetotransport mechanism dominated by the charge accumulation at the organic–FM interfaces.