Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films
Abstract
Background: The application of superparamagnetic particles as biomolecular transporters in microfluidic systems for lab-on-a-chip applications crucially depends on the ability to control their motion. One approach for magnetic-particle motion control is the superposition of static magnetic stray field landscapes (MFLs) with dynamically varying external fields. These MFLs may emerge from magnetic domains engineered both in shape and in their local anisotropies. Motion control of smaller beads does necessarily need smaller magnetic patterns, i.e., MFLs varying on smaller lateral scales. The achievable size limit of engineered magnetic domains depends on the magnetic patterning method and on the magnetic anisotropies of the material system. Smallest patterns are expected to be in the range of the domain wall width of the particular material system. To explore these limits a patterning technology is needed with a spatial resolution significantly smaller than the domain wall width. Results: We demonstrate the application of a helium ion microscope with a beam diameter of 8 nm as a mask-less method for local domain patterning of magnetic thin-film systems. For a prototypical in-plane exchange-bias system the domain wall width has been investigated as a function of the angle between unidirectional anisotropy and domain wall. By shrinking the domain sizemore »
- Authors:
-
[1];
[1];
[1];
[5];
[4];
[2];
[1]
- Univ. of Kessel (Germany). Inst. of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT)
- Univ. of Bielefeld (Germany). Physics of supramolecular Systems and Surfaces. Faculty of Physics
- Univ. of Kessel (Germany). Inst. of Physics and Center for Interdisciplinary Nanostructure Science and Technology (CINSaT); Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
- Peter Grünberg Inst. “Electronic Properties”, Jülich (Germany)
- Peter Grünberg Inst. “Electronic Properties”, Jülich (Germany); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Univ. of Bielefeld (Germany). Thin Films and Physics of Nanostructures. Faculty of Physics
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1628622
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Beilstein Journal of Nanotechnology
- Additional Journal Information:
- Journal Volume: 9; Journal ID: ISSN 2190-4286
- Publisher:
- Beilstein Institute
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; science & technology - other topics; materials science; physics; exchange bias; helium ion microscopy; ion bombardment induced magnetic patterning; magnetic domains; magnetic nanostructures
Citation Formats
Gaul, Alexander, Emmrich, Daniel, Ueltzhöffer, Timo, Huckfeldt, Henning, Doğanay, Hatice, Hackl, Johanna, Khan, Muhammad Imtiaz, Gottlob, Daniel M., Hartmann, Gregor, Beyer, André, Holzinger, Dennis, Nemšák, Slavomír, Schneider, Claus M., Gölzhäuser, Armin, Reiss, Günter, and Ehresmann, Arno. Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films. United States: N. p., 2018.
Web. doi:10.3762/bjnano.9.276.
Gaul, Alexander, Emmrich, Daniel, Ueltzhöffer, Timo, Huckfeldt, Henning, Doğanay, Hatice, Hackl, Johanna, Khan, Muhammad Imtiaz, Gottlob, Daniel M., Hartmann, Gregor, Beyer, André, Holzinger, Dennis, Nemšák, Slavomír, Schneider, Claus M., Gölzhäuser, Armin, Reiss, Günter, & Ehresmann, Arno. Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films. United States. https://doi.org/10.3762/bjnano.9.276
Gaul, Alexander, Emmrich, Daniel, Ueltzhöffer, Timo, Huckfeldt, Henning, Doğanay, Hatice, Hackl, Johanna, Khan, Muhammad Imtiaz, Gottlob, Daniel M., Hartmann, Gregor, Beyer, André, Holzinger, Dennis, Nemšák, Slavomír, Schneider, Claus M., Gölzhäuser, Armin, Reiss, Günter, and Ehresmann, Arno. Mon .
"Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films". United States. https://doi.org/10.3762/bjnano.9.276. https://www.osti.gov/servlets/purl/1628622.
@article{osti_1628622,
title = {Size limits of magnetic-domain engineering in continuous in-plane exchange-bias prototype films},
author = {Gaul, Alexander and Emmrich, Daniel and Ueltzhöffer, Timo and Huckfeldt, Henning and Doğanay, Hatice and Hackl, Johanna and Khan, Muhammad Imtiaz and Gottlob, Daniel M. and Hartmann, Gregor and Beyer, André and Holzinger, Dennis and Nemšák, Slavomír and Schneider, Claus M. and Gölzhäuser, Armin and Reiss, Günter and Ehresmann, Arno},
abstractNote = {Background: The application of superparamagnetic particles as biomolecular transporters in microfluidic systems for lab-on-a-chip applications crucially depends on the ability to control their motion. One approach for magnetic-particle motion control is the superposition of static magnetic stray field landscapes (MFLs) with dynamically varying external fields. These MFLs may emerge from magnetic domains engineered both in shape and in their local anisotropies. Motion control of smaller beads does necessarily need smaller magnetic patterns, i.e., MFLs varying on smaller lateral scales. The achievable size limit of engineered magnetic domains depends on the magnetic patterning method and on the magnetic anisotropies of the material system. Smallest patterns are expected to be in the range of the domain wall width of the particular material system. To explore these limits a patterning technology is needed with a spatial resolution significantly smaller than the domain wall width. Results: We demonstrate the application of a helium ion microscope with a beam diameter of 8 nm as a mask-less method for local domain patterning of magnetic thin-film systems. For a prototypical in-plane exchange-bias system the domain wall width has been investigated as a function of the angle between unidirectional anisotropy and domain wall. By shrinking the domain size of periodic domain stripes, we analyzed the influence of domain wall overlap on the domain stability. Finally, by changing the geometry of artificial two-dimensional domains, the influence of domain wall overlap and domain wall geometry on the ultimate domain size in the chosen system was analyzed. Conclusion: The application of a helium ion microscope for magnetic patterning has been shown. It allowed for exploring the fundamental limits of domain engineering in an in-plane exchange-bias thin film as a prototypical system. For two-dimensional domains the limit depends on the domain geometry. The relative orientation between domain wall and anisotropy axes is a crucial parameter and therefore influences the achievable minimum domain size dramatically.},
doi = {10.3762/bjnano.9.276},
journal = {Beilstein Journal of Nanotechnology},
number = ,
volume = 9,
place = {United States},
year = {Mon Dec 03 00:00:00 EST 2018},
month = {Mon Dec 03 00:00:00 EST 2018}
}
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Figure 1: Phase contrast MFM images of engineered parallel-stripe domains. Magnetic domains with antiparallel magnetization orientation have been observed at an MFM tip height of 80 nm as a function of $\vartheta$, the angle between unidirectional anisotropy and DW normal vector, indicated in the bottom right corner of the images.more »
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Effect of Ga+ ion irradiation on the structural and magnetic properties of CoFe/IrMn exchange biased bilayers
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Postannealing of magnetic tunnel junctions with ion-bombardment-modified exchange bias
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Control of magnetic anisotropy and magnetic patterning of perpendicular Co∕Pt multilayers by laser irradiation
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Partial magnetization reversal in a perpendicular exchange-biased [Pd∕Co]∕FeMn film through laser annealing
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Thermal exchange bias field drift in field cooled Mn83Ir17/Co70Fe30 thin films after 10 keV He ion bombardment
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Dynamics of superparamagnetic microbead transport along magnetic nanotracks by magnetic domain walls
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Tailored domain wall charges by individually set in-plane magnetic domains for magnetic field landscape design
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Néel walls between tailored parallel-stripe domains in IrMn/CoFe exchange bias layers
journal, March 2015
- Ueltzhöffer, Timo; Schmidt, Christoph; Krug, Ingo
- Journal of Applied Physics, Vol. 117, Issue 12
Manipulation of superparamagnetic beads on patterned Au/Co/Au multilayers with perpendicular magnetic anisotropy
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Nanopatterning spin-textures: A route to reconfigurable magnonics
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Atomic displacements in metals due to low‐energy light ion implantation
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Focused ion beam irradiation of ferromagnetic thin films in the presence of an applied field
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Magnetic charge distribution and stray field landscape of asymmetric néel walls in a magnetically patterned exchange bias layer system
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Modification of the saturation magnetization of exchange bias thin film systems upon light-ion bombardment
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Light ion irradiation of Co/Pt systems: Structural origin of the decrease in magnetic anisotropy
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Application of pulsed laser annealing to ferromagnetic GaMnAs
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- Physical Review B, Vol. 81, Issue 11
Micromagnetic simulations of magnetization dynamics in a nanowire induced by a spin-polarized current injected via a point contact
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Domain structure of magnetically micro-patterned PtMn/NiFe exchange bias bilayers
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Nanoimprint Lithography Materials Development for Semiconductor Device Fabrication
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Nanosecond-timescale low error switching of in-plane magnetic tunnel junctions through dynamic Oersted-field assisted spin-Hall effect
text, January 2016
- Aradhya, Sriharsha V.; Rowlands, Graham E.; Oh, Junseok
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Nanopatterning reconfigurable magnetic landscapes via thermally assisted scanning probe lithography
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Works referencing / citing this record:
Magnetic Materials and Systems: Domain Structure Visualization and Other Characterization Techniques for the Application in the Materials Science and Biomedicine
journal, January 2020
- Nisticò, Roberto; Cesano, Federico; Garello, Francesca
- Inorganics, Vol. 8, Issue 1
Magnetic Domains without Domain Walls: A Unique Effect of Ion Bombardment in Ferrimagnetic Films
journal, January 2020
- Frąckowiak, Łukasz; Kuświk, Piotr; Chaves-O’Flynn, Gabriel David
- Physical Review Letters, Vol. 124, Issue 4
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