Research Topics Graduate Institute of Applied Science and Engineering Speaker: Yi Ding Student No:

What are Ferroic Materials Classification of Ferroic Materials Ferroic Materials are Smart Materials Applications of Ferroic Materials Current Research Topics

Ferroic Materials Definition: Ferroic material is a simplified term to represent Ferroelastic, Ferromagnetic and Ferroelectric materials.

Classification of Ferroic Materials Ferroelastic/martensitic materials Ferroelectric materials Ferromagnetic materials Hybrid ferroic materials (Ferroelasto- ferroelectric materials, ferroelasto- ferromagnetic materials, etc. … ) Non-conventional ferroic materials (HTc superconductors, some BCS superconductors, giant magnetoresistive materials)

Ferroelastic materials Ferroelastic Phase Transition involves the deformation of the unit cell x y (a) (b) (c)

Ferroelectric materials Ferroelectric Phase Transition involves the change of relative lattice positions (a) (b)

Ferromagnetic materials Ferromagnetic Phase Transition Ferromagnetic phase Paramagnetic phase

Ferroic Materials are Smart Materials Multi-functional materials, materials having both sensing and actuation functions. Low level mimic of biological materials. Sensing Information processing Action

Smart Materials--- Mimic Biological Functions Sensing Actuation NERVES Pressure sensor (Electrocmechanical) Temperature sensor (Thermoelectric) Chemical sensor (Electrochemical) MUSCLES Contraction and Expansion (Electromechanical and electrochemical)

Applications of Ferroic Materials Piezoelectric (Ferroelectric Materials) Transducer, speaker, microphone, actuator, ultrasonic motor Pyroelectric (Ferroelectric Materials) Remote control devices, night vision, infrared camera PTC (Ferroelectric Materials) Hair dryer, cooker, heat regulated auto protection systems Shape Memory Alloy (Ferroelastic Materials) Thermal engine, satellite solar panel, artificial bone structures, artery expander Magnetostrictive materials (Ferromagnetic Materials) Ultrasonic transducers, Actuators Permanent magnets (Ferromagnetic Materials) Power generators, antennas

Applications of Piezoelectric Materials Transducers, speakers, microphones, actuators, ultrasonic motors, lighters, sonars, space telescope mirrors, precision displacement and rotation control systems, etc. Electric energy Mechanical energy

Dielectric Applications (ferroelctric materials) Standard Multilayer Chip Capacitors Up to 12 mF Up to 500 VDC High Voltage Chip Capacitors Up to 1 mF Up to 10 kVDC

Current Research Topics Permittivity modulation study of Multiferroic AlN/NiFe/AlN Films Aluminum Nitride (AlN), one of the popular materials in electronic devices, possessing a wide band gap (6.3 eV), a high chemical stability and a good dielectric properties has been studied for insulator in transistors, transducers and microwave devices

Permittivity of NiFe-controlled AlN/NiFe/AlN films In this study, real-part permittivity is measured on AlN/NiFe/AlN and AlN/NiFe/AlN/NiFe/AlN structures, respectively from 40Hz to 30MHz. configuration of AlN/NiFe/AlN structure

The real-part permittivity of AlN/NiFe/AlN where (a) NiFe(1 nm) (b) NiFe(5 nm) (c) NiFe(10 nm), and (d) AlN(50 nm)/NiFe(20 nm)/AlN(50 nm)/NiFe(20 nm)/AlN(50 nm).

Aim of Our Program Explore physics of ferroic transition and associated multiscale phenomena by an interdisciplinary approach. Explore and discover novel properties in ferroic materials and help to develop new functional materials.

Acceptance of article pc77182/ PB11 for physica status solidi (c) From: VCH-PSSC-CORR To: Sent: Tue, 13 Nov :52: Subject: Acceptance of article pc77182/ PB11 for physica status solidi (c) Dear author, We are pleased to inform you that your article No. pc77182/ PB11 Permittivity modulation study of Multiferroic AlN/NiFe/AlN Films has been accepted for publication in physica status solidi (c) (Proceedings of ISAMMA) Your paper carries the date of receipt The date of acceptance is