Browsing by Author "Huang, Y. L."

Now showing 1 - 3 of 3

Multifunctionalities driven by ferroic domains
(2014-08-14)
Yang, J. C.
;
Huang, Y. L.
;
He, Q.
;
Chu, Y. H.
;
材料科學與工程學系
Considerable attention has been paid to ferroic systems in pursuit of advanced applications in past decades. Most recently, the emergence and development of multiferroics, which exhibit the coexistence of different ferroic natures, has offered a new route to create functionalities in the system. In this manuscript, we step from domain engineering to explore a roadmap for discovering intriguing phenomena and multifunctionalities driven by periodic domain patters. As-grown periodic domains, offering exotic order parameters, periodic local perturbations and the capability of tailoring local spin, charge, orbital and lattice degrees of freedom, are introduced as modeling templates for fundamental studies and novel applications. We discuss related significant findings on ferroic domain, nanoscopic domain walls, and conjunct heterostructures based on the well-organized domain patterns, and end with future prospects and challenges in the field. (C) 2014 AIP Publishing LLC.
OSNP: Secure wireless authentication protocol using one-time key
(2009-11-01)
Huang, Y. L.
;
Lu, P. H.
;
Tygar, J. D.
;
Joseph, A. D.
;
電控工程研究所
Handover security and efficiency have become more and more important in modern wireless network designs. In this paper, we propose a new protocol using the one-time key for user authentication. The proposed protocol can support both intra-domain and inter-domain authentications efficiently. Our protocol requires five messages for intra-domain initial authentication; three for subsequent authentication; and five for handover authentication. No authentication server is needed during handover, and our design reduces the computing load on the authentication server. We show an integration and implementation of EAP from 802.1X and our protocol, giving an easy way to apply our protocol on existing 802.11 wireless networks. The proposed protocol is realized and verified on the SWOON secure wireless testbed. (C) 2009 Elsevier Ltd. All rights reserved.
Single-domain multiferroic BiFeO3 films
(2016-09-01)
Kuo, C. -Y.
;
Hu, Z.
;
Yang, J. C.
;
Liao, S. -C.
;
Huang, Y. L.
The strong coupling between antiferromagnetism and ferroelectricity at room temperature found in BiFeO3 generates high expectations for the design and development of technological devices with novel functionalities. However, the multi-domain nature of the material tends to nullify the properties of interest and complicates the thorough understanding of the mechanisms that are responsible for those properties. Here we report the realization of a BiFeO3 material in thin film form with single-domain behaviour in both its magnetism and ferroelectricity: the entire film shows its antiferromagnetic axis aligned along the crystallographic b axis and its ferroelectric polarization along the c axis. With this we are able to reveal that the canted ferromagnetic moment due to the Dzyaloshinskii-Moriya interaction is parallel to the a axis. Furthermore, by fabricating a Co/BiFeO3 heterostructure, we demonstrate that the ferromagnetic moment of the Co film does couple directly to the canted moment of BiFeO3.