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Mélica FN, Saavedra E, Escrig J, Bajales N, Linarez Pérez OE, Arciniegas Jaimes DM. Static and dynamic magnetic properties of circular and square cobalt nanodots in hexagonal cells. Phys Chem Chem Phys 2024; 26:5621-5632. [PMID: 38288508 DOI: 10.1039/d3cp05432b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
In this work we performed a detailed numerical analysis to investigate the static and dynamic magnetic properties of hexagonal cells of square and circular cobalt nanodots as a function of the distance between them and the external magnetic field to which they are subjected. By simulating hysteresis curves with the external magnetic field applied parallel and perpendicular to the plane of these nanostructures, we can conclude that the cobalt nanodots presented a significant perpendicular magnetic anisotropy. We also obtained that the coercivity increases with decreasing volume, which implies that the circular dots have a higher coercivity than the square dots. Furthermore, we studied the dynamic susceptibility of these systems and found that it is possible to control both the position and the number of resonance peaks by controlling the geometry and the distance between the magnetic nanodots. This work provides useful information on the behaviour of cobalt nanodot arrays, opening paths for the design and improvement of two-dimensional technological devices.
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Affiliation(s)
- Franco N Mélica
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Químicas, Departamento de Fisicoquímica, Haya de la Torre esq. Medina Allende, X5000HUA Córdoba, Argentina.
| | - Eduardo Saavedra
- Universidad de Santiago de Chile (USACH), Departamento de Física, Av. Víctor Jara 3493, 9170124 Santiago, Chile
| | - Juan Escrig
- Universidad de Santiago de Chile (USACH), Departamento de Física, Av. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology (CEDENNA), 9170124 Santiago, Chile
| | - Noelia Bajales
- Universidad Nacional de Córdoba (UNC), FAMAF, 5000 Córdoba, Argentina
- CONICET, IFEG, Av. Medina Allende s/n, 5000 Córdoba, Argentina
| | - Omar E Linarez Pérez
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Químicas, Departamento de Fisicoquímica, Haya de la Torre esq. Medina Allende, X5000HUA Córdoba, Argentina.
- CONICET, INFIQC, Haya de la Torre esq. Medina Allende, X5000HUA, Córdoba, Argentina
| | - Diana M Arciniegas Jaimes
- Universidad Nacional de Córdoba (UNC), Facultad de Ciencias Químicas, Departamento de Fisicoquímica, Haya de la Torre esq. Medina Allende, X5000HUA Córdoba, Argentina.
- CONICET, INFIQC, Haya de la Torre esq. Medina Allende, X5000HUA, Córdoba, Argentina
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Deka A, Rana B, Otani Y, Fukuma Y. Ferromagnetic resonance excited by interfacial microwave electric field: the role of current-induced torques. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 35:214003. [PMID: 36898153 DOI: 10.1088/1361-648x/acc377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2022] [Accepted: 03/10/2023] [Indexed: 06/18/2023]
Abstract
Excitation of magnetization dynamics in magnetic materials, especially in ultrathin ferromagnetic films, is of utmost importance for developing various ultrafast spintronics devices. Recently, the excitation of magnetization dynamics, i.e. ferromagnetic resonance (FMR) via electric field-induced modulation of interfacial magnetic anisotropies, has received particular attention due to several advantages, including lower power consumption. However, several additional torques generated by unavoidable microwave current induced because of the capacitive nature of the junctions may also contribute to the excitation of FMR apart from electric field-induced torques. Here, we study the FMR signals excited by applying microwave signal across the metal-oxide junction in CoFeB/MgO heterostructures with Pt and Ta buffer layers. Analysis of the resonance line shape and angular dependent behavior of resonance amplitude revealed that apart from voltage-controlled in-plane magnetic anisotropy (VC-IMA) torque a significant contribution can also arises from spin-torques and Oersted field torques originating from the flow of microwave current through metal-oxide junction. Surprisingly, the overall contribution from spin-torques and Oersted field torques are comparable to the VC-IMA torque contribution, even for a device with negligible defects. This study will be beneficial for designing future electric field-controlled spintronics devices.
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Affiliation(s)
- Angshuman Deka
- Birck Nanotechnology Center, School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, United States of America
- Department of Physics and Information Technology, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820-8502, Japan
| | - Bivas Rana
- Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz University in Poznań, Uniwersytetu Poznanskiego 2, Poznań 61-614, Poland
- Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
| | - YoshiChika Otani
- Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
- Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
| | - Yasuhiro Fukuma
- Department of Physics and Information Technology, Kyushu Institute of Technology, 680-4 Kawazu, Iizuka 820-8502, Japan
- Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako 351-0198, Japan
- Research Center for Neuromorphic AI hardware, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan
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Kumar Mondal A, Majumder S, Kumar Mahato B, Barman S, Otani Y, Barman A. Bias field orientation driven reconfigurable magnonics and magnon-magnon coupling in triangular shaped Ni 80Fe 20nanodot arrays. NANOTECHNOLOGY 2023; 34:135701. [PMID: 36571848 DOI: 10.1088/1361-6528/acae5e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Accepted: 12/25/2022] [Indexed: 06/17/2023]
Abstract
Reconfigurable magnonics have attracted intense interest due to their myriad advantages including energy efficiency, easy tunability and miniaturization of on-chip data communication and processing devices. Here, we demonstrate efficient reconfigurability of spin-wave (SW) dynamics as well as SW avoided crossing by varying bias magnetic field orientation in triangular shaped Ni80Fe20nanodot arrays. In particular, for a range of in-plane angles of bias field, we achieve mutual coherence between two lower frequency modes leading to a drastic modification in the ferromagnetic resonance frequency. Significant modification in magnetic stray field distribution is observed at the avoided crossing regime due to anisotropic dipolar interaction between two neighbouring dots. Furthermore, using micromagnetic simulations we demonstrate that the hybrid SW modes propagate longer through an array as opposed to the non-interacting modes present in this system, indicating the possibility of coherent energy transfer of hybrid magnon modes. This result paves the way for the development of integrated on-chip magnonic devices operating in the gigahertz frequency regime.
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Affiliation(s)
- Amrit Kumar Mondal
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Block JD, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Sudip Majumder
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Block JD, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Bipul Kumar Mahato
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Block JD, Sector-III, Salt Lake, Kolkata 700 106, India
| | - Saswati Barman
- Institute of Engineering and Management, Sector V, Salt Lake, Kolkata 700091, India
| | - Yoshichika Otani
- CEMS-RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
| | - Anjan Barman
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, Block JD, Sector-III, Salt Lake, Kolkata 700 106, India
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