Download 研究方向與內容

Research Topics
Graduate Institute of Applied
Science and Engineering
Speaker: Yi Ding
Student No: 495598050
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What are Ferroic Materials
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Classification of Ferroic Materials
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Ferroic Materials are Smart
Materials
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Applications of Ferroic Materials
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Current Research Topics
Ferroic Materials
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Definition:
Ferroic material is a simplified term to
represent Ferroelastic, Ferromagnetic
and Ferroelectric materials.
Classification of Ferroic Materials
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Ferroelastic/martensitic materials
Ferroelectric materials
Ferromagnetic materials
Hybrid ferroic materials (Ferroelastoferroelectric materials, ferroelastoferromagnetic materials, etc. …)
Non-conventional ferroic materials (HTc
superconductors, some BCS superconductors,
giant magnetoresistive materials)
Ferroelastic materials
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y
Ferroelastic Phase Transition involves
the deformation of the unit cell
x
(a)
(b)
(c)
Ferroelectric materials
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Ferroelectric Phase Transition involves
the change of relative lattice positions
(a)
(b)
Ferromagnetic materials
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Ferromagnetic Phase Transition
Paramagnetic phase
Ferromagnetic phase
Ferroic Materials are Smart Materials
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Multi-functional materials, materials having
both sensing and actuation functions. Low
level mimic of biological materials.
Information
processing
Sensing
Action
Smart Materials---Mimic Biological Functions
Sensing
NERVES
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Pressure sensor
(Electrocmechanical)
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Temperature
sensor
(Thermoelectric)
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Chemical sensor
(Electrochemical)
Actuation
MUSCLES
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Contraction and
Expansion
(Electromechanical and
electrochemical)
Applications of Ferroic Materials
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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
Electric energy

Mechanical energy
Transducers, speakers, microphones, actuators,
ultrasonic motors, lighters, sonars, space telescope
mirrors, precision displacement and rotation control
systems, etc.
Dielectric Applications (ferroelctric materials)
Standard Multilayer Chip
Capacitors
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Up to 12 mF
Up to 500 VDC
High Voltage Chip
Capacitors
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Up to 1 mF
Up to 10 kVDC
Current Research Topics
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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
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In this study, real-part
permittivity is measured
on AlN/NiFe/AlN and
AlN/NiFe/AlN/NiFe/AlN
structures, respectively
from 40Hz to 30MHz.
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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
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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 <[email protected]>
To: [email protected]
Sent: Tue, 13 Nov 2007 10:52:24 +0100
Subject: Acceptance of article pc77182/ PB11 for physica status solidi (c)
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Dear author,
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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 07.05.2007. The date of acceptance is
27.10.2007.