Article
Chemistry, Multidisciplinary
Jing Chen, Guohua Wu, Ping Gu, Yumei Tang, Chun Yang, Zhendong Yan, Chaojun Tang, Zhengqi Liu, Fan Gao, Pinggen Cai
Summary: The study focuses on enhancing the transverse magneto-optical Kerr effect (TMOKE) of ultra-thin magnetic dielectric films, achieved through the excitation of strong magnetic resonances due to plasmonic hybridization between Au nanowires and substrate. The coupled system forms two strong magnetic resonances leading to a significant TMOKE signal increase in 30 nm thick ultra-thin magnetic dielectric films, showing potential applications in nanophotonics, magnonics, and spintronics.
Article
Materials Science, Multidisciplinary
Weiwei Zhang, Zhanghua Chen, Vladimir I. Belotelov, Yujun Song
Summary: The Kerr null points of ferromagnetic thin films can be controlled by adjusting the thickness of different material layers. The introduction of non-ferromagnetic materials can enhance the Kerr effect of the ferromagnetic thin films.
Article
Materials Science, Multidisciplinary
Pampi Saha, Seema, V. R. Reddy, Pooja Gupta, Mukul Gupta, R. Rawat
Summary: The effect of substrate induced strain and Fe/Rh stoichiometry on the antiferromagnetic-ferromagnetic first order transition in sputter deposited FeRh thin films has been studied. It was found that strain influences the transition temperature.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Applied
Dedalo Sanz-Hernandez, Luka Skoric, Miguel Angel Cascales-Sandoval, Amalio Fernandez-Pacheco
Summary: Magneto-optical techniques have been developed as key tools for characterizing magnetic effects at the nanoscale. In this study, the researchers introduce the dark-field magneto-optical Kerr effect (DFMOKE), a technique specifically designed for characterizing three-dimensional magnetic nanostructures. They demonstrate the principles of DFMOKE and modify a standard focused MOKE magnetometer to perform measurements. Finally, they showcase the power of DFMOKE by detecting the independent magnetic switching of a single tilted 3D nanowire and a magnetic thin film that surrounds it.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
M. Jovicevic-Klug, P. Jovicevic-Klug, J. McCord, B. Podgornik
Summary: This study demonstrates the potential of using MOKE microscopy to analyze the microstructure and stress state of martensitic steels, without the need for chemical etching, and even achieving accurate volumetric fraction estimation of retained austenite. By combining MOKE microscopy with other techniques, the residual stress state of steel can be accurately determined, and significant reduction in residual stresses can be achieved through deep cryogenic treatment, providing valuable insights for steel properties research.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Xiaoyan Zhu, Yang Li, Yali Xie, Qian Qiu, Cuimei Cao, Xiao Hu, Wenhui Xie, Tian Shang, Yang Xu, Lin Sun, Wenjuan Cheng, Dongmei Jiang, Qingfeng Zhan
Summary: We quantitatively investigated the magnetocrystalline anisotropy of metamagnetic FeRh films epitaxially grown on MgO(001) substrates. We observed that the in-plane fourfold magnetic anisotropy of epitaxial FeRh films is reoriented and enhanced when FeRh undergoes a phase transition from ferromagnetic to antiferromagnetic states. The observed anisotropy is attributed to the exchange coupling between the residual ferromagnetic moments caused by antisite defects and the antiferromagnetic matrix. Furthermore, our first-principles calculations suggest that the lattice compressive strain imposed by the MgO substrate is crucial in determining the magnetic structure of FeRh films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Sehwan Song, Jiwoong Kim, Jisung Lee, Hyegyeong Kim, Noboru Miyata, Neeraj Kumar, Y. Soh, Jae Hyuck Jang, Chanyong Hwang, Brian J. Kirby, Sungkyun Park
Summary: FeRh thin films exhibit unexpected ferromagnetic characteristics at low temperatures, which is different from their bulk state. The coexistence of antiferromagnetic and residual ferromagnetic states leads to thermomagnetic irreversibility and negative magnetoresistance. Polarized neutron reflectometry reveals the presence of non-uniform ferromagnetic states at the interfaces, with the bottom region correlated to structural distortion and the top region originating from non-stoichiometry.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Zedong Hu, Juanjuan Lu, Hongyi Dou, Jianan Shen, James P. Barnard, Juncheng Liu, Xinghang Zhang, Haiyan Wang
Summary: In this work, a unique anodic aluminum oxide (AAO) template was used to grow a thin Co seed layer and the following self-assembled metal-oxide (Co-BaTiO3) vertically aligned nanocomposite thin film layer. The researchers observed significant magnetic anisotropy and strong magneto-optical coupling properties, and successfully achieved the fabrication of high density perpendicular magnetic tunneling junction (p-MTJ). They also discovered a strong polar magneto-optical Kerr effect (MOKE), which inspires a novel optical-based reading method of the MTJ states.
Article
Physics, Applied
Tomohiro Uchimura, Ju-Young Yoon, Yuma Sato, Yutaro Takeuchi, Shun Kanai, Ryota Takechi, Keisuke Kishi, Yuta Yamane, Samik DuttaGupta, Jun'ichi Ieda, Hideo Ohno, Shunsuke Fukami
Summary: In this study, hysteresis-loop measurement and domain imaging were performed on (1 (1) over bar 00)-oriented D0(19)-Mn3+xSn1-x (-0.11 <= x <= 0.14) thin films using the magneto-optical Kerr effect (MOKE), and the results were compared with the anomalous Hall effect (AHE) measurement. The x dependence of AHE and MOKE showed a similar trend, indicating the same origin. Furthermore, the reversal process of the chiral-spin structure in non-collinear antiferromagnetic thin films was found to start with nucleation of sub-micrometer-scale domains and preferentially propagate along the [11(2) over bar 0] direction.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Condensed Matter
Bita Roumi, Reza Abdi-Ghaleh
Summary: The paper numerically investigated the magneto-optical properties and figure of merit behavior of a layered structure composed of graphene, InAs, Polyimide, and Aluminum layers in the terahertz frequency region. Results showed that the performance of the structure with graphene sheets is higher compared to without. The structure's performance can be controlled and tuned by parameters such as magnetic field strength, charge carrier density of graphene, and InAs layer thickness.
SUPERLATTICES AND MICROSTRUCTURES
(2021)
Article
Physics, Applied
Carmen Martin Valderrama, Mikel Quintana, Ane Martinez-de-Guerenu, Tomoki Yamauchi, Yuki Hamada, Yuichiro Kurokawa, Hiromi Yuasa, Andreas Berger
Summary: This comprehensive experimental study examines the limiting factors and physical mechanisms affecting the performance of transverse magneto-optical Kerr effect (T-MOKE) ellipsometry, focusing on achieving high sensitivity and reduced acquisition times. It is found that the best sensitivity is obtained with incident light polarization with balanced s-p components. The study also explores alternative measurement strategies and finds that the method's theoretical description accurately captures data for any s-p combination of the incoming light.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Cory D. Cress, Darshana Wickramaratne, Matthew R. Rosenberger, Zachariah Hennighausen, Patrick G. Callahan, Samuel W. LaGasse, Noam Bernstein, Olaf M. van 't Erve, Berend T. Jonker, Syed B. Qadri, Joseph C. Prestigiacomo, Marc Currie, Igor I. Mazin, Steven P. Bennett
Summary: In this work, we demonstrate the direct writing of nanoscale magnetic ordering patterns in FeRh films using focused helium-ion beam irradiation. By characterizing the changes in magnetic order induced by He+ irradiation, as well as quantifying strain- and defect-induced alterations in spin-flip energy, we show promise for the development of in-plane AF-FM spintronic devices. This approach may reduce the complexity of fabrication processes and eliminate interfacial polarization losses in such devices.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Carmen Martin Valderrama, Mikel Quintana, Ane Martinez-de-Guerenu, Tomoki Yamauchi, Yuki Hamada, Yuichiro Kurokawa, Hiromi Yuasa, Andreas Berger
Summary: This experimental study demonstrates the precise determination of magneto-optical and magnetic properties of insertion layers using T-MOKE ellipsometry, and shows its ability to accurately detect small effects in ferromagnetic structures.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Alexis Dufour, Laure Bsawmaii, Damien Jamon, Emmanuel Marin, Sophie Neveu, Stephanie Reynaud, Sylvain Girard, Francois Royer
Summary: An innovative functionalization method is described for enhancing the Faraday effect of microstructured silica-based optical fibers. By varying the process parameters, the film thickness and nanoparticle concentrations can be tailored to optimize the fiber's magneto-optical response, leading to significant polar magneto-optical effects. This method shows promise for designing fiber-based sensors of magnetic fields.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Ning Ding, Kunihiro Yananose, Carlo Rizza, Feng-Ren Fan, Shuai Dong, Alessandro Stroppa
Summary: We studied the magneto-optical Kerr effect (MOKE) in a two-dimensional heterostructure CrI3/In2Se3/CrI3 using density functional theory calculations and symmetry analysis. The mirror and time-reversal symmetries are broken by the spontaneous polarization in the In2Se3 ferroelectric layer and the antiferromagnetic ordering in the CrI3 layers, thereby activating MOKE. Our results demonstrate that the Kerr angle can be reversed by either the polarization or the antiferromagnetic order parameter. This suggests that ferroelectric and antiferromagnetic 2D heterostructures could be utilized for compact information storage devices, with the information encoded by the two ferroelectric or the two time-reversed antiferromagnetic states and read optically via MOKE.
ACS APPLIED MATERIALS & INTERFACES
(2023)
