University of Twente Student Theses


Magnetoelectric thin film laminate composites for voltage-controlled tunable nonreciprocal RF devices

Szepieniec, Jesse M. (2012) Magnetoelectric thin film laminate composites for voltage-controlled tunable nonreciprocal RF devices.

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Abstract:Military and commercial applications for microwave components continue to demand smaller, more efficient, frequency-agile devices. As the mobile frequency spectrum grows increasingly crowded, the demands on battery life, size, weight and costs, increase. Adaptability to these ever changing conditions becomes beneficial. It is technologies that enable such adaptability that are becoming increasingly relevant. Conventional, magnetic field tuning of ferrite devices is often slow, bulky, noisy, and requires comparatively high power consumption for operation. Voltage-tunability provides a pathway towards tunable RF components with fast tuning, low noise levels, requiring minimal power and producing components that can be easily miniaturized and integrated. The feasibility of magnetoelectrically tunable RF isolators for frequencies above 10 GHz was investigated. Metallic magnetostatic surface wave isolators were constructed employing Ni80Fe20 films in coplanar and microstrip geometries. Magnetoelectric coupling was shown for a Co80Fe20/(011)PMN-PT(70:30) heterostructure. The Mr/Ms ratio was reduced by 26% by an applied electric field of 0.01 kV/cm. Barium M-type hexaferrite (BaM) thin films were grown on highly (111) oriented Pt plated silicon and PMN-PT(011) substrates through metallo-organic decomposition. Based on the high squareness ratio obtained for the out-ofplane orientation, the film on silicon was suspected to be highly textured with the crystallographic c-axis out-of-plane. Sol-gel deposition of PMNPT (70:30) was investigated. When annealed at 600�, a predominantly perovskite, highly (021) oriented spin-coated film is obtained. Finally, the first steps towards a ME model of voltage-tunable RF devices were undertaken. Basic 3D, two-way, linear magnetoelectrical coupling was realized in a magnetostatic approximation using finite element method (FEM) software.
Item Type:Essay (Master)
UCLA Aneeve Nanotechnologies
Faculty:TNW: Science and Technology
Subject:33 physics
Programme:Applied Physics MSc (60436)
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