Toward highly functional devices using multi-ferroics
Sign in to YouTube
Sign in to YouTube
Sign in to YouTube
Uploaded on Apr 15, 2010
[Keio Spintronics Network - Kimura's Laboratory , Osaka University]
At Osaka Universitys Graduate School of Engineering Science, the Kimura Laboratory is studying phenomena where dielectric and magnetic properties are interrelated. This research has several aims: to design and synthesize various materials; to precisely measure their structural, magnetic, and dielectric properties; to understand these phenomena; and to develop materials with highly functional characteristics.
Q. Basically, in this research we design and make materials ourselves to obtain new properties, including functional properties. We investigate physical phenomena, and in the future, wed like to put them to use in new devices.
Recently, the Kimura Lab has been focusing on materials called multiferroics. Ordinarily, electric fields and spin, or charge and magnetic fields, arent related much, so they dont influence each other much. But in multiferroics, which combine magnetic and ferroelectric ordering in one material, these properties interact, resulting in electromagnetic effects. The question of why magnetic and dielectric properties are linked in multiferroics hasnt yet been answered. But recently, its become clear that the key to this problem is the fact that spins are arranged in spirals in the multiferroics.
Q. These spiral structures are of two types, clockwise and anticlockwise. Theyre mirror images of each other. The mirror relationship is only evident when we consider the magnetic structure. Basically, such magnetic structures are not very stable, so if you apply a slight magnetic field, they collapse. Since the magnetic structures had a strong relationship with polarization, electric polarization also collapses. In such materials, their polarization changes dramatically by applying a magnetic field.
To date, multiferroics have been searched for in iron oxides. But the Kimura Lab has made a pioneering discovery in simple copper oxide: a ferroelectric property is caused by a spiral magnetic structure at very high temperatures. If multiferroics R&D advances, enabling electromagnetic effects to be controlled, itll be possible to design materials that are only magnetic when a voltage is applied. Its expected that this would lead to the development of highly functional devices.
Q. One of our aims is to find multiferroics that can actually be utilized to make useful things, though it may take 20 years. But thats not our only aim. The most interesting thing about research is that things happen that we dont predict. We work in one direction, but sometimes things happen that we dont think of beforehand. I enjoy this interesting aspect, and Id like our students to enjoy it, too. And I hope we can do research that keeps opening up new worlds.
Standard YouTube License
- 2:20 HUTCHISON effect: Electret Energy Experimentby HUTCHlSONeffect Featured 14,324
- 43:54 Physics of Exchange Interactions in Solidsby keiouniversity1,970 views
- 29:33 Multiferroics:Modelling and Understandingby keiouniversity2,082 views
- 34:46 Spin Electronics and Spin Photonics on Oxide Semiconductorsby keiouniversity794 views
- 4:42 Creation of spintronics materials using artificial nanostructure controlby keiouniversity1,780 views
- 20:37 Emerging technologies based on multiferroic materialsby National Physical Laboratory2,307 views
- 14:16 Designing the Ultimate Solar Hot Air Collector!by G. Scott Davis23,915 views
- 89 videos Play all Science Lecturesby NPLdigital
- 2:32 Bedini - Bipolar - Dual Driver Coilby MrAnguswangus1,761 views
- 21:48 Capacitors and Dielectricsby DrPhysicsA10,678 views
- 4:08 V Series FRAM from Fujitsu offers extended voltage rangeby FujitsuSemiUS905 views
- 22:18 Capacitors - A Level Physicsby DrPhysicsA34,582 views
- 3:43 How to Create Electricity with Magnets - Navy Industrial Training Videoby Bright Enlightenment2,659 views
- 7:51 How to make crystal batteries free energy 1 of 2by ZakHarley69,240 views
- 6:20 Textured YBCO Superconductorby warnichtmehrfrei5,368 views
- 25:21 TEDxHouston 2011 - Wade Adams - Nanotechnology and Energyby TEDxTalks44,115 views
- 8:05 Kal Chaudavi ki Raat Thi.. Jagjit Singhby Sachin Gadekar957,071 views
- 6:54 Permanent Magnets Doing Work 2by AdminOnDuty4,561 views
- 6:24 John Pendry on the birth and promise of metamaterialsby SPIETV3,765 views
- 2:27 Measuring Dielectric Properties of Liquids from Agilent Technologiesby azonano1,979 views