This study examines time-dependent spin transport in magnetic heterostructures under alternating-current drive using a time-dependent spin diffusion framework. We show that the impedance of spin valves can transition from resistive to capacitive behavior when switched from parallel to antiparallel magnetic configuration, revealing a tunable dynamical response rooted in spin accumulation and relaxation. This mechanism enables high-frequency spintronic functionalities, including a proposed “spin resonator” that toggles between an LR damper and an LC resonator without relying on a conventional charge-based capacitor.

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• Spin diffusion
• Spintronics
• Ultrafast magnetic effects
• Spin valves