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Gigahertz Non-Volatile Voltage Tuned Magnetic Film Inductors using a Ni/NiFe Core

Abstract

Magnetic film inductors show promise for increasing the inductance density, and thus shrinking the size, of integrated inductors. With a higher inductance density, integrated inductors can improve RF circuit performance. The ability to individually tune the integrated inductors using an applied voltage has been researched in recent years, often using MEMS type devices. This study utilized the properties of multiferroics to achieve voltage tuned inductance for microstrip inductors. The microstrip inductors demonstrated inductance enhancement up to 75%, a maximum tuning of 25%, and to have operating frequency up to 2.4 GHz, important for microwave applications. The quality factor of the inductor was enhanced by 170% from the air-core inductor. Taking advantage of the properties of the two-phase multiferroic, the inductance change was also demonstrated to be non-volatile. The unique properties of this inductor allow for both discrete non-volatile, as well as continuous, tuning of the inductance at GHz frequencies.

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