Magnetic control of dielectric properties of Ba_0.6Sr _0.4TiO₃ in a trilayer system

Dielectric properties of Ba_0.6Sr_0.4TiO₃ (BST) in a layered terfenol-D/BST/terfenol-D system were investigated. Dielectric properties of the BST layer can be adjusted by magnetostrictive strain of terfenol-D layers under applied magnetic fields. Our results show that the small-signal dielectric constant of BST can be tuned ranging from about 2300 to 4000 by a small magnetic field. By adjusting the relative layer thickness ratio, a more broad adjustable dielectric constant and tunability of BST layer can be designed, which may have potential applications in sensitive multifunctional devices and microwave devices.