Interfacial scattering effect on anisotropic magnetoresistance and anomalous Hall effect in Ta/Fe multilayers
KAUST DepartmentImaging and Characterization Core Lab
Material Science and Engineering Program
Nanofabrication Core Lab
Physical Science and Engineering (PSE) Division
Thin Films & Characterization
Online Publication Date2017-12-26
Print Publication Date2018-05
Permanent link to this recordhttp://hdl.handle.net/10754/626869
MetadataShow full item record
AbstractThe effect of interfacial scattering on anisotropic magnetoresistance (AMR) and anomalous Hall effect (AHE) was studied in the (Ta12n/Fe36n)n multilayers, where the numbers give the thickness in nanometer and n is an integer from 1 to 12. The multilayer structure has been confirmed by the XRR spectra and STEM images of cross-sections. The magneto-transport properties were measured by four-point probe method in Hall bar shaped samples in the temperature range of 5 - 300 K. The AMR increases with n, which could be ascribed to the interfacial spin-orbit scattering. At 5 K, the longitudinal resistivity (ρ) increases by 6.4 times and the anomalous Hall resistivity (ρ) increases by 49.4 times from n =1 to n =12, indicative of the interfacial scattering effect. The skew-scattering, side-jump and intrinsic contributions to the AHE were separated successfully. As n increases from 1 to 12, the intrinsic contribution decreases because of the decaying crystallinity or finite size effect and the intrinsic contribution dominated the AHE for all samples. The side jump changes from negative to positive because the interfacial scattering and intralayer scattering in Fe layers both contribute to side jump in the AHE but with opposite sign.
CitationZhang Q, Zhang J, Zhao Y, Wen Y, Li P, et al. (2018) Interfacial scattering effect on anisotropic magnetoresistance and anomalous Hall effect in Ta/Fe multilayers. AIP Advances 8: 055813. Available: http://dx.doi.org/10.1063/1.5006355.
SponsorsThe research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST). QZ and PL acknowledge the financial support by KAUST sensor project (REP/1/2708-01). XH acknowledges the financial support by KAUST sensor project (REP/1/2719-01).
Except where otherwise noted, this item's license is described as All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). https://doi.org/10.1063/1.5006355
Showing items related by title, author, creator and subject.
Spin-Decoupled Multifunctional Metasurface for Asymmetric Polarization GenerationXu, Yuehong; Li, Quan; Zhang, Xueqian; Wei, Minggui; Xu, Quan; Wang, Qiu; Zhang, Huifang; Zhang, Wentao; Hu, Cong; Zhang, Zhenwei; Zhang, Cunlin; Zhang, Xixiang; Han, Jiaguang; Zhang, Weili (ACS Photonics, American Chemical Society (ACS), 2019-10-28) [Article]Integrating multiple functionalities into a single device is a striking field in metasurfaces. One promising aspect is polarization-dependent meta-devices enabled by simultaneous phase control over orthogonally polarized waves. Among these, Pancharatnam-Berry (PB) metasurfaces have drawn enormous interest owing to their natural and robust phase control ability over different circularly polarized waves. However, the phase responses are locked to be opposite with each other, resulting in interrelated functionalities under the circularly polarized incidence. Here, a generic designing method based on transmission-type dielectric metasurfaces is proposed in the terahertz regime, which breaks this relation by further incorporating dynamic phase with geometric phase, namely, spin-decoupled phase control method. We demonstrate this method by designing and characterizing an efficient multifunctional meta-grating, which splits different circularly polarized waves to asymmetric angles under normal incidences. More importantly, we promote this method by designing several multiplexed meta-gratings for applications of asymmetric polarization generation, which can convert arbitrary linearly polarized wave to two different linearly polarized waves with nearly equal strength and split them to asymmetric angles with a polarization-insensitive efficiency. The designing strategy proposed here shows an impressive robustness and a great flexibility for designing multifunctional metasurface-based devices and opens new avenues toward modulation of polarization states and the application of metasurfaces in beam steering and polarization multiplexing systems.
The Visual Object Tracking VOT2017 Challenge ResultsKristan, Matej; Leonardis, Ales; Matas, Jiri; Felsberg, Michael; Pflugfelder, Roman; Zajc, Luka Cehovin; Vojir, Tomas; Hager, Gustav; Lukezic, Alan; Eldesokey, Abdelrahman; Fernandez, Gustavo; Garcia-Martin, Alvaro; Muhic, A.; Petrosino, Alfredo; Memarmoghadam, Alireza; Vedaldi, Andrea; Manzanera, Antoine; Tran, Antoine; Alatan, Aydin; Mocanu, Bogdan; Chen, Boyu; Huang, Chang; Xu, Changsheng; Sun, Chong; Du, Dalong; Zhang, David; Du, Dawei; Mishra, Deepak; Gundogdu, Erhan; Velasco-Salido, Erik; Khan, Fahad Shahbaz; Battistone, Francesco; Subrahmanyam, Gorthi R. K. Sai; Bhat, Goutam; Huang, Guan; Bastos, Guilherme; Seetharaman, Guna; Zhang, Hongliang; Li, Houqiang; Lu, Huchuan; Drummond, Isabela; Valmadre, Jack; Jeong, Jae-chan; Cho, Jae-il; Lee, Jae-Yeong; Noskova, Jana; Zhu, Jianke; Gao, Jin; Liu, Jingyu; Kim, Ji-Wan; Henriques, Joao F.; Martinez, Jose M.; Zhuang, Junfei; Xing, Junliang; Gao, Junyu; Chen, Kai; Palaniappan, Kannappan; Lebeda, Karel; Gao, Ke; Kitani, Kris M.; Zhang, Lei; Wang, Lijun; Yang, Lingxiao; Wen, Longyin; Bertinetto, Luca; Poostchi, Mahdieh; Danelljan, Martin; Müller, Matthias; Zhang, Mengdan; Yang, Ming-Hsuan; Xie, Nianhao; Wang, Ning; Miksik, Ondrej; Moallem, P.; M, Pallavi Venugopal; Senna, Pedro; Torr, Philip H. S.; Wang, Qiang; Yu, Qifeng; Huang, Qingming; Martin-Nieto, Rafael; Bowden, Richard; Liu, Risheng; Tapu, Ruxandra; Hadfield, Simon; Lyu, Siwei; Golodetz, Stuart; Choi, Sunglok; Zhang, Tianzhu; Zaharia, Titus; Santopietro, Vincenzo; Zou, Wei; Hu, Weiming; Tao, Wenbing; Li, Wenbo; Zhou, Wengang; Yu, Xianguo; Bian, Xiao; Li, Yang; Xing, Yifan; Fan, Yingruo; Zhu, Zheng; Zhang, Zhipeng; He, Zhiqun (2017 IEEE International Conference on Computer Vision Workshops (ICCVW), Institute of Electrical and Electronics Engineers (IEEE), 2018-01-22) [Conference Paper]The Visual Object Tracking challenge VOT2017 is the fifth annual tracker benchmarking activity organized by the VOT initiative. Results of 51 trackers are presented; many are state-of-the-art published at major computer vision conferences or journals in recent years. The evaluation included the standard VOT and other popular methodologies and a new 'real-time' experiment simulating a situation where a tracker processes images as if provided by a continuously running sensor. Performance of the tested trackers typically by far exceeds standard baselines. The source code for most of the trackers is publicly available from the VOT page. The VOT2017 goes beyond its predecessors by (i) improving the VOT public dataset and introducing a separate VOT2017 sequestered dataset, (ii) introducing a realtime tracking experiment and (iii) releasing a redesigned toolkit that supports complex experiments. The dataset, the evaluation kit and the results are publicly available at the challenge website1.
Unveiling of the energy storage mechanisms of multi -modified (Nb2O5@C)/rGO nanoarrays as anode for high voltage supercapacitors with formulated ionic liquid electrolytesZhang, Jiahe; Zhang, Haitao; Zhang, Yaqin; Zhang, Junwei; He, Hongyan; Zhang, Xixiang; Shim, Jae Jin; Zhang, Suojiang (Electrochimica Acta, Elsevier Ltd, 2019-04-29) [Article]A better understanding of the energy-storage mechanisms in complex pseudocapacitive nanostructures is essential to improve the performances of nanohybrid supercapacitors. In this study, highly interface modified Nb2O5 nanoarrays, attached to graphene nanosheets, were carefully designed and synthesized. The electrochemical performances were evaluated in an organic electrolyte, a formulated ionic-liquid mixture electrolyte, and a nanocomposite ionogel electrolyte, respectively. The capacitive and faradaic storage contributions were assessed qualitatively in diverse electrolytes at various temperatures. The capacitive contribution in the ionic liquid electrolyte was found to rise with increasing temperature. A molecular dynamics simulation proved that the increased diffusion coefficient of large ions was much more pronounced than that of the small Li+ ions. A carefully optimized quasi-solid-state lithium ion capacitor, fabricated using a (Nb2O5@C)/rGO nanoarchitecture as the anode and an ionic liquid gel separator, delivered an energy density of 101 Wh kg−1 and a power density of 24 kW kg−1 at 60 °C. The efficient coupling between the nanohybrids and a complex ionogel electrolyte opens a new window for the rational design of high energy-density supercapacitors.