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Corona RM, Saavedra E, Castillo-Sepulveda S, Escrig J, Altbir D, Carvalho-Santos VL. Curvature-induced stabilization and field-driven dynamics of magnetic hopfions in toroidal nanorings. NANOTECHNOLOGY 2023; 34:165702. [PMID: 36689765 DOI: 10.1088/1361-6528/acb557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Accepted: 01/23/2023] [Indexed: 06/17/2023]
Abstract
Three dimensional magnetic textures are a cornerstone in magnetism research. In this work, we analyze the stabilization and dynamic response of a magnetic hopfion hosted in a toroidal nanoring with intrinsic Dzyaloshinskii-Moriya interaction simulating FeGe. Our results evidence that unlike their planar counterparts, where perpendicular magnetic anisotropies are necessary to stabilize hopfions, the shape anisotropy originated on the torus symmetry naturally yields the nucleation of these topological textures. We also analyze the magnetization dynamical response by applying a magnetic field pulse to differentiate among several magnetic patterns. Finally, to understand the nature of spin wave modes, we analyze the spatial distributions of the resonant mode amplitudes and phases and describe the differences among bulk and surface modes. Importantly, hopfions lying in toroidal nanorings present a non-circularly symmetric poloidal resonant mode, which is not observed in other systems hosting hopfions.
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Affiliation(s)
- R M Corona
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - E Saavedra
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - S Castillo-Sepulveda
- Departamento de Ingeniería, Universidad Autónoma de Chile, Avda. Pedro de Valdivia 425, Providencia, Chile
| | - J Escrig
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - D Altbir
- Universidad de Santiago de Chile, Departamento de Física, Avda. Víctor Jara 3493, 9170124 Santiago, Chile
- Center for the Development of Nanoscience and Nanotechnology, CEDENNA, Avda. Libertador Bernardo O'Higgins 3363, 9170124 Santiago, Chile
| | - V L Carvalho-Santos
- Universidade Federal de Viçosa, Departamento de Física, Avenida Peter Henry Rolfs s/n, 36570-000, Viçosa, MG, Brasil
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Manzin A, Ferrero R, Vicentini M. Application of Magnonic Crystals in Magnetic Bead Detection. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3278. [PMID: 36234407 PMCID: PMC9565837 DOI: 10.3390/nano12193278] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/12/2022] [Accepted: 09/15/2022] [Indexed: 06/16/2023]
Abstract
This paper aims at studying a sensor concept for possible integration in magnetic field-based lab-on-chip devices that exploit ferromagnetic resonance (FMR) phenomena in magnonic crystals. The focus is on 2D magnetic antidot arrays, i.e., magnetic thin films with periodic non-magnetic inclusions (holes), recently proposed as magnetic field sensor elements operating in the gigahertz (GHz) range. The sensing mechanism is here demonstrated for magnetic nano/microbeads adsorbed on the surface of permalloy (Ni80Fe20) antidot arrays with a rhomboid lattice structure and variable hole size. Through extensive micromagnetic modelling analysis, it is shown that the antidot arrays can be used as both bead traps and high-sensitivity detectors, with performance that can be tuned as a function of bead size and magnetic moment. A key parameter for the detection mechanism is the antidot array hole size, which affects the FMR frequency shifts associated with the interaction between the magnetization configuration in the nanostructured film and the bead stray field. Possible applications of the proposed device concept include magnetic immunoassays, using magnetic nano/microbeads as probes for biomarker detection, and biomaterial manipulation.
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Affiliation(s)
- Alessandra Manzin
- Istituto Nazionale di Ricerca Metrologica (INRIM), 10135 Torino, Italy
| | - Riccardo Ferrero
- Istituto Nazionale di Ricerca Metrologica (INRIM), 10135 Torino, Italy
| | - Marta Vicentini
- Istituto Nazionale di Ricerca Metrologica (INRIM), 10135 Torino, Italy
- Politecnico di Torino, 10129 Torino, Italy
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Competition of Magnetic Anisotropies in Permalloy Antidot Lattices. MAGNETOCHEMISTRY 2022. [DOI: 10.3390/magnetochemistry8050055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Antidot lattices made of magnetic thin films are good candidates to be employed in future magnetic recording media. In this manuscript we present a study on the effect of shape and field-induced magnetic anisotropies on the magnetization reversal of 10 nm and 50 nm thick permalloy antidot lattices. Rounded antidot square lattices were fabricated using a combination of electron beam evaporation and laser interference lithography, covering surfaces of a few cm2. We demonstrate that a magnetic anisotropy induced in the samples, as a consequence of an applied magnetic field during growth, competes with the shape anisotropy that dominates the response of the patterned thin films, and that the effect of the field-induced magnetic anisotropy scales with the thickness of the antidot thin films. Finally, we have quantified the anisotropy constant attributable to the uniaxial field-induced magnetic anisotropy in our antidot lattices. These findings are supported by micromagnetic simulations performed using MuMax3.
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Salaheldeen M, Abu-Dief AM, Martínez-Goyeneche L, Alzahrani SO, Alkhatib F, Álvarez-Alonso P, Blanco JÁ. Dependence of the Magnetization Process on the Thickness of Fe 70Pd 30 Nanostructured Thin Film. MATERIALS 2020; 13:ma13245788. [PMID: 33352979 PMCID: PMC7767229 DOI: 10.3390/ma13245788] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 12/07/2020] [Accepted: 12/15/2020] [Indexed: 12/02/2022]
Abstract
Fe–Pd magnetic shape-memory alloys are of major importance for microsystem applications due to their magnetically driven large reversible strains under moderate stresses. In this context, we focus on the synthesis of nanostructured Fe70Pd30 shape-memory alloy antidot array thin films with different layer thicknesses in the range from 20 nm to 80 nm, deposited onto nanostructured alumina membranes. A significant change in the magnetization process of nanostructured samples was detected by varying the layer thickness. The in-plane coercivity for the antidot array samples increased with decreasing layer thickness, whereas for non-patterned films the coercive field decreased. Anomalous coercivity dependence with temperature was detected for thinner antidot array samples, observing a critical temperature at which the in-plane coercivity behavior changed. A significant reduction in the Curie temperature for antidot samples with thinner layer thicknesses was observed. We attribute these effects to complex magnetization reversal processes and the three-dimensional magnetization profile induced by the nanoholes. These findings could be of major interest in the development of novel magnetic sensors and thermo-magnetic recording patterned media based on template-assisted deposition techniques.
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Affiliation(s)
- Mohamed Salaheldeen
- Physics Department, Faculty of Science, Sohag University, Sohag 82524, Egypt
- Departamento de Física, Universidad de Oviedo, C/Calvo Sotelo 18, 33007 Oviedo, Spain; (L.M.-G.); (J.Á.B.)
- Correspondence: (M.S.); (P.Á.-A.); Tel.: +34-985-18-2132 (P.Á.-A.)
| | - Ahmed Mohamed Abu-Dief
- Chemistry Department, College of Science, Taibah University, Madinah P.O. Box 344, Saudi Arabia; (A.M.A.-D.); (S.O.A.)
- Chemistry Department, Faculty of Science, Sohag University, Sohag 82534, Egypt
| | - Lucía Martínez-Goyeneche
- Departamento de Física, Universidad de Oviedo, C/Calvo Sotelo 18, 33007 Oviedo, Spain; (L.M.-G.); (J.Á.B.)
| | - Seraj Omar Alzahrani
- Chemistry Department, College of Science, Taibah University, Madinah P.O. Box 344, Saudi Arabia; (A.M.A.-D.); (S.O.A.)
| | - Fatmah Alkhatib
- Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, Makkah P.O. Box 715, Saudi Arabia;
| | - Pablo Álvarez-Alonso
- Departamento de Física, Universidad de Oviedo, C/Calvo Sotelo 18, 33007 Oviedo, Spain; (L.M.-G.); (J.Á.B.)
- Correspondence: (M.S.); (P.Á.-A.); Tel.: +34-985-18-2132 (P.Á.-A.)
| | - Jesús Ángel Blanco
- Departamento de Física, Universidad de Oviedo, C/Calvo Sotelo 18, 33007 Oviedo, Spain; (L.M.-G.); (J.Á.B.)
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