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Domain Overlap In Antiferromagnetically Coupled [Co/Pt]/Nio/ [Co/Pt] Multilayers, Andrew Baruth, Lu Yuan, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Sy_Hwang Liou, Shireen Adenwalla
Domain Overlap In Antiferromagnetically Coupled [Co/Pt]/Nio/ [Co/Pt] Multilayers, Andrew Baruth, Lu Yuan, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Sy_Hwang Liou, Shireen Adenwalla
Sy-Hwang Liou Publications
Antiferromagnetically coupled magnetic thin films with perpendicular anisotropy exhibit domain overlap regions originating from magnetostatic stray fields localized in the vicinity of the domain walls. Using high resolution magnetic force microscopy, the authors investigate these overlap regions in [Co/Pt] /NiO/ [Co/Pt] multilayers with various strengths of the interlayer exchange coupling. They develop a simple model that provides a quantitative explanation of the formation of these regions and the relationship between the domain overlap width and the coupling strength. Their results are important for application of magnetic layered structures with perpendicular anisotropy in advanced magnetoresistive devices.
Sy-Hwang Liou Publications 1982–2006
Sy-Hwang Liou Publications 1982–2006
Sy-Hwang Liou Publications
Includes 204 articles and chapters, plus 2 patents. Current as of spring 2006.
Direct Synthesis Of Single-Walled Carbon Nanotubes Bridging Metal Electrodes By Laser-Assisted Chemical Vapor Deposition, J. Shi, Yongfeng Lu, K.J. Yi, Yushun Lin, Sy_Hwang Liou, J.B. Hou, X.W. Wang
Direct Synthesis Of Single-Walled Carbon Nanotubes Bridging Metal Electrodes By Laser-Assisted Chemical Vapor Deposition, J. Shi, Yongfeng Lu, K.J. Yi, Yushun Lin, Sy_Hwang Liou, J.B. Hou, X.W. Wang
Sy-Hwang Liou Publications
Direct synthesis of single-walled carbon nanotubes (SWNTs) bridging prepatterned Mo electrodes has been achieved using laser-assisted chemical vapor deposition (LCVD). The synthesized SWNTs are found predominantly semiconducting. By controlling the spot size of the focused laser beam, synthesis of SWNTs can be achieved in a localized manner, which is governed by the thermal and optical properties of materials as well as the laser parameters. The synthesis process is fast and can be achieved in both far- and near-infrared laser wavelength regions. LCVD method provides a potential approach to in situ remove SWNTs with specific chiralities during the growth. © 2006 …
Origin Of The Interlayer Exchange Coupling In [Co/Pt]/Nio/ [Co/Pt] Multilayers Studied With Xas, Xmcd, And Micromagnetic Modeling, Andrew Baruth, D.J. Keavney, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Lu Yuan, Sy_Hwang Liou, Shireen Adenwalla
Origin Of The Interlayer Exchange Coupling In [Co/Pt]/Nio/ [Co/Pt] Multilayers Studied With Xas, Xmcd, And Micromagnetic Modeling, Andrew Baruth, D.J. Keavney, John D. Burton, Karolina Janicka, Evgeny Y. Tsymbal, Lu Yuan, Sy_Hwang Liou, Shireen Adenwalla
Sy-Hwang Liou Publications
The origin of the oscillatory interlayer exchange coupling in [Co/Pt] /NiO/ [Co/Pt] multilayers is investigated using advanced microscopy and spectroscopy techniques and micromagnetic modeling. X-ray magnetic circular dichroism (XMCD) measurements show the presence of the canting of Ni spins in the NiO film being greater for antiferromagnetically coupled multilayers than for ferromagnetically coupled ones. This behavior is consistent with the model, which assumes a different sign of the exchange coupling at the two interfaces and the antiferromagnetic layer-by-layer coupling in the NiO film. An unexpectedly short attenuation length of 4 Å for secondary electrons in NiO is measured, which has …
Perturbation Of Magnetostatic Modes Observed By Ferromagnetic Resonance Force Microscopy, R. Urban, A. Putilin, P.E. Wigen, Sy_Hwang Liou, M.C. Cross, P.C. Hammel, M.L. Roukes
Perturbation Of Magnetostatic Modes Observed By Ferromagnetic Resonance Force Microscopy, R. Urban, A. Putilin, P.E. Wigen, Sy_Hwang Liou, M.C. Cross, P.C. Hammel, M.L. Roukes
Sy-Hwang Liou Publications
Magnetostatic modes of yttrium iron garnet (YIG) films are investigated by ferromagnetic resonance force microscopy. A thin-film “probe” magnet at the tip of a compliant cantilever introduces a local inhomogeneity in the internal field of the YIG sample. This influences the shape of the sample’s magnetostatic modes, thereby measurably perturbing the strength of the force coupled to the cantilever. We present a theoretical model that explains these observations; it shows that the tip-induced variation of the internal field creates either a local “potential barrier” or “potential well” for the magnetostatic waves. The data and model together indicate that local magnetic …
Microcantilever Torque Magnetometery Study Of Patterned Magnetic Films, L. Yuan, Lei Gao, Ildar F. Sabiryanov, Sy-Hwang Liou, M. D. Chabot, D. H. Min, J. Moreland, B. Han
Microcantilever Torque Magnetometery Study Of Patterned Magnetic Films, L. Yuan, Lei Gao, Ildar F. Sabiryanov, Sy-Hwang Liou, M. D. Chabot, D. H. Min, J. Moreland, B. Han
Sy-Hwang Liou Publications
The study of the small, defined magnetic structures has attracted much attention due to interest in both technology applications and fundamental research in micromagnetism. Microcantilever torque magnetometry (MTM) is a promising new experimental technique for measuring such small magnetic features [1]. One of the challenges of using this technique is to place the sample on the cantilever. In this work, we develop a new process for preparing patterned magnetic film on cantilever and show a primarily result of magnetic interactions in a paired magnetic bar measured by MTM. The process of patterning the magnetic film on the cantilever is following: …
Magnetic Force Microscopy Study Of Coptcro Perpendicular Media With Superparamagnetic And Permanent Magnet Tips, L. Yuan, Lei Gao, L. Nicholl, Sy-Hwang Liou, M. Zheng, E. N. Abarra, B. R. Acharya, G. Choe, S. S. Malhotra, B. Han
Magnetic Force Microscopy Study Of Coptcro Perpendicular Media With Superparamagnetic And Permanent Magnet Tips, L. Yuan, Lei Gao, L. Nicholl, Sy-Hwang Liou, M. Zheng, E. N. Abarra, B. R. Acharya, G. Choe, S. S. Malhotra, B. Han
Sy-Hwang Liou Publications
Magnetic force microscopy (MFM) has been widely used in the study of magnetic recording media. It requires high resolution MFM tips as well as better understanding of the obtained magnetic images. In this study, we compared the images obtained by superparamagnetic and permanent MFM tips, that allows us to explain the issues related to the frequency double in some of domain images of the recording media. We also investigated the domain structures of high density recording bits (up to 1100 kfci) written on ac and dc-erased CoPtCrO perpendicular magnetic recording (PMR) media with permanent magnet MFM tips under ambient conditions. …
Structure Of Sc2O3 Films Epitaxially Grown On Α -Al2O3 (0001), A.R. Kortan, N. Kopylov, J. Kwo, M. Hong, C.P. Chen, J.P. Mannaerts, Sy_Hwang Liou
Structure Of Sc2O3 Films Epitaxially Grown On Α -Al2O3 (0001), A.R. Kortan, N. Kopylov, J. Kwo, M. Hong, C.P. Chen, J.P. Mannaerts, Sy_Hwang Liou
Sy-Hwang Liou Publications
The crystal structure of scandium oxide films epitaxially grown on α -Al2O3 (0001) under an ultrahigh-vacuum is studied by single-crystal x-ray diffraction. The Sc2O3 film grows in bixbyite phase on the basal (0001) surface of the sapphire substrate with its (111) axis aligned parallel to the substrate normal. In-plane orientation of the film, however, exhibits two distinct growth directions that are defined by the two possible surface orientations of the stepped α -Al2O3 substrate. The atomic structure of the high-quality epitaxial film is fully relaxed and the film has unusual thickness …