1
|
Solovev PN, Izotov AV, Belyaev BA. Numerical study of structural and magnetic properties of thin films obliquely deposited on rippled substrates. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:495802. [PMID: 34525461 DOI: 10.1088/1361-648x/ac26fc] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2021] [Accepted: 09/15/2021] [Indexed: 06/13/2023]
Abstract
Structural modulation in thin films plays a substantial role in the formation of their magnetic properties. By producing topographic patterns in thin films, it is possible to engineer their magnetic response. Here, we report on the numerical study of the relationship between structural and static magnetic properties of thin films obliquely deposited on substrates with the sinusoidal surface. 3D Monte Carlo film growth simulations show that, under certain deposition conditions, an inhomogeneous columnar morphology can form in the films caused by the shadowing effect and the rippled substrate. Calculations of the demagnetizing tensors for these films demonstrate that their columnar structure is the source of the shape-induced uniaxial magnetic anisotropy that varies nonmonotonically with the deposition angle. Micromagnetic simulations of the generated films confirm the uniaxial character of the shape-induced anisotropy, and also show that magnetization reversal occurs via an incoherent rotation of magnetic moments.
Collapse
Affiliation(s)
- P N Solovev
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, 660036 Krasnoyarsk, Russia
| | - A V Izotov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, 660036 Krasnoyarsk, Russia
- Siberian Federal University, 79 Svobodny pr., 660041 Krasnoyarsk, Russia
| | - B A Belyaev
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 50/38 Akademgorodok, 660036 Krasnoyarsk, Russia
- Siberian Federal University, 79 Svobodny pr., 660041 Krasnoyarsk, Russia
| |
Collapse
|
2
|
Röder F, Hlawacek G, Wintz S, Hübner R, Bischoff L, Lichte H, Potzger K, Lindner J, Fassbender J, Bali R. Direct Depth- and Lateral- Imaging of Nanoscale Magnets Generated by Ion Impact. Sci Rep 2015; 5:16786. [PMID: 26584789 PMCID: PMC4653643 DOI: 10.1038/srep16786] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Accepted: 10/20/2015] [Indexed: 11/09/2022] Open
Abstract
Nanomagnets form the building blocks for a variety of spin-transport, spin-wave and data storage devices. In this work we generated nanoscale magnets by exploiting the phenomenon of disorder-induced ferromagnetism; disorder was induced locally on a chemically ordered, initially non-ferromagnetic, Fe60Al40 precursor film using nm diameter beam of Ne(+) ions at 25 keV energy. The beam of energetic ions randomized the atomic arrangement locally, leading to the formation of ferromagnetism in the ion-affected regime. The interaction of a penetrating ion with host atoms is known to be spatially inhomogeneous, raising questions on the magnetic homogeneity of nanostructures caused by ion-induced collision cascades. Direct holographic observations of the flux-lines emergent from the disorder-induced magnetic nanostructures were made in order to measure the depth- and lateral- magnetization variation at ferromagnetic/non-ferromagnetic interfaces. Our results suggest that high-resolution nanomagnets of practically any desired 2-dimensional geometry can be directly written onto selected alloy thin films using a nano-focussed ion-beam stylus, thus enabling the rapid prototyping and testing of novel magnetization configurations for their magneto-coupling and spin-wave properties.
Collapse
Affiliation(s)
- Falk Röder
- Triebenberg Labor, Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Gregor Hlawacek
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - Sebastian Wintz
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - Lothar Bischoff
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - Hannes Lichte
- Triebenberg Labor, Institut für Strukturphysik, Technische Universität Dresden, D-01062 Dresden, Germany
| | - Kay Potzger
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - Jürgen Lindner
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| | - Jürgen Fassbender
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany.,Institut für Festkörperphysik, Technische Universität Dresden, Helmholtzstr. 10, D-01069 Dresden, Germany
| | - Rantej Bali
- Helmholtz-Zentrum Dresden-Rossendorf, Institut für Ionenstrahlphysik und Materialforschung, Bautzner Landstraße 400, D-01328 Dresden, Germany
| |
Collapse
|
3
|
Cantu-Valle J, Betancourt I, Sanchez JE, Ruiz-Zepeda F, Maqableh MM, Mendoza-Santoyo F, Stadler BJH, Ponce A. Mapping the magnetic and crystal structure in cobalt nanowires. JOURNAL OF APPLIED PHYSICS 2015; 118:024302. [PMID: 26221057 PMCID: PMC4499055 DOI: 10.1063/1.4923745] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2015] [Accepted: 06/23/2015] [Indexed: 06/05/2023]
Abstract
Using off-axis electron holography under Lorentz microscopy conditions to experimentally determine the magnetization distribution in individual cobalt (Co) nanowires, and scanning precession-electron diffraction to obtain their crystalline orientation phase map, allowed us to directly visualize with high accuracy the effect of crystallographic texture on the magnetization of nanowires. The influence of grain boundaries and disorientations on the magnetic structure is correlated on the basis of micromagnetic analysis in order to establish the detailed relationship between magnetic and crystalline structure. This approach demonstrates the applicability of the method employed and provides further understanding on the effect of crystalline structure on magnetic properties at the nanometric scale.
Collapse
Affiliation(s)
- Jesus Cantu-Valle
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| | - Israel Betancourt
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| | - John E Sanchez
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| | - Francisco Ruiz-Zepeda
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| | - Mazin M Maqableh
- Electrical and Computer Engineering, University of Minnesota , 4-174 EE/CSci Bldg., 200 Union St. SE, Minneapolis, Minnesota 55455, USA
| | - Fernando Mendoza-Santoyo
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| | - Bethanie J H Stadler
- Electrical and Computer Engineering, University of Minnesota , 4-174 EE/CSci Bldg., 200 Union St. SE, Minneapolis, Minnesota 55455, USA
| | - Arturo Ponce
- Department of Physics and Astronomy, University of Texas at San Antonio, One UTSA Circle , San Antonio, Texas 78249, USA
| |
Collapse
|