---
_id: '635'
abstract:
- lang: eng
text: Magnetic vortex structures are of high technological relevance due
to their possible application in magnetic memory. Moreover, investigating magnetization
reversal via vortex formation is an important topic in basic research. Typically,
such vortices are only investigated in homogeneous magnetic materials of diverse
shapes. Here, we report for the first time on micromagnetic simulation of vortex
formation in magnetic bow-tie nanostructures, comprising alternating parts from
iron and permalloy, investigated for two different thicknesses and under different
angles of the external magnetic field. While no vortex was found in pure permalloy
square, nanoparticles of the dimensions investigated in this study and in case
of iron only a relatively thick sample allowed for vortex formation, different
numbers of vortices and antivortices were found in the bow-tie structures prepared
from both materials, depending on the angular field orientation and the sample
thickness. By stabilizing more than one vortex in a confined nanostructure, it
is possible to store more than one bit of information in it. Our micromagnetic
simulations reveal that such bi-material structures are highly relevant not only
for basic research, but also for data storage applications.
article_number: '5'
article_type: original
author:
- first_name: Devika
full_name: Sudsom, Devika
last_name: Sudsom
- first_name: Irén
full_name: Juhász Junger, Irén
last_name: Juhász Junger
- first_name: Christoph
full_name: Döpke, Christoph
last_name: Döpke
- first_name: Tomasz
full_name: Blachowicz, Tomasz
last_name: Blachowicz
- first_name: Lothar
full_name: Hahn, Lothar
last_name: Hahn
- first_name: Andrea
full_name: Ehrmann, Andrea
id: '223776'
last_name: Ehrmann
orcid: 0000-0003-0695-3905
citation:
alphadin: 'Sudsom, Devika ; Juhász Junger, Irén ; Döpke,
Christoph ; Blachowicz, Tomasz
; Hahn, Lothar ; Ehrmann,
Andrea: Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material
Bow-Tie Structures. In: Condensed Matter Bd. 5 (2020), Nr. 1'
ama: Sudsom D, Juhász Junger I, Döpke C, Blachowicz T, Hahn L, Ehrmann A. Micromagnetic
Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures. Condensed
Matter. 2020;5(1). doi:10.3390/condmat5010005
apa: Sudsom, D., Juhász Junger, I., Döpke, C., Blachowicz, T., Hahn, L., & Ehrmann,
A. (2020). Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material
Bow-Tie Structures. Condensed Matter, 5(1). https://doi.org/10.3390/condmat5010005
bibtex: '@article{Sudsom_Juhász Junger_Döpke_Blachowicz_Hahn_Ehrmann_2020, title={Micromagnetic
Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie Structures},
volume={5}, DOI={10.3390/condmat5010005},
number={15}, journal={Condensed Matter}, author={Sudsom, Devika and Juhász Junger,
Irén and Döpke, Christoph and Blachowicz, Tomasz and Hahn, Lothar and Ehrmann,
Andrea}, year={2020} }'
chicago: Sudsom, Devika, Irén Juhász Junger, Christoph Döpke, Tomasz Blachowicz,
Lothar Hahn, and Andrea Ehrmann. “Micromagnetic Simulation of Vortex Development
in Magnetic Bi-Material Bow-Tie Structures.” Condensed Matter 5, no. 1
(2020). https://doi.org/10.3390/condmat5010005.
ieee: D. Sudsom, I. Juhász Junger, C. Döpke, T. Blachowicz, L. Hahn, and A. Ehrmann,
“Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie
Structures,” Condensed Matter, vol. 5, no. 1, 2020.
mla: Sudsom, Devika, et al. “Micromagnetic Simulation of Vortex Development in Magnetic
Bi-Material Bow-Tie Structures.” Condensed Matter, vol. 5, no. 1, 5, 2020,
doi:10.3390/condmat5010005.
short: D. Sudsom, I. Juhász Junger, C. Döpke, T. Blachowicz, L. Hahn, A. Ehrmann,
Condensed Matter 5 (2020).
date_created: 2021-01-03T14:42:18Z
date_updated: 2021-05-19T14:01:34Z
ddc:
- '530'
department:
- _id: '103'
doi: 10.3390/condmat5010005
file:
- access_level: open_access
content_type: application/pdf
creator: aehrmann
date_created: 2021-01-03T14:41:31Z
date_updated: 2021-01-03T14:41:31Z
file_id: '636'
file_name: _2020_Sudsom_CondMatter5_5_corr.pdf
file_size: 4886370
relation: main_file
success: 1
file_date_updated: 2021-01-03T14:41:31Z
funded_apc: '1'
has_accepted_license: '1'
intvolume: ' 5'
issue: '1'
keyword:
- magnetic nanostructures
- micromagnetic simulation
- bow-tie structure
- vortex
- magnetization reversal
- iron
- permalloy
- lithography
language:
- iso: eng
oa: '1'
publication: Condensed Matter
publication_identifier:
issn:
- 2410-3896
publication_status: published
quality_controlled: '1'
status: public
title: Micromagnetic Simulation of Vortex Development in Magnetic Bi-Material Bow-Tie
Structures
type: journal_article
user_id: '237837'
volume: 5
year: '2020'
...
---
_id: '678'
abstract:
- lang: eng
text: Asymmetric magnetic hysteresis loops are usually found in exchange
bias (EB) systems, typically after field cooling a system below the Néel temperature
of an antiferromagnet exchange coupled to a ferromagnet. Alternatively, asymmetric
hysteresis loops may occur due to undetected minor loops or in systems with a
rotational anisotropy. Here, we report on an exchange bias thin film system MgO(100)/Co/CoO,
examined at room temperature, which is far above the blocking temperature, by
the magneto-optical Kerr effect (MOKE). While the longitudinal hysteresis loops
partly show steps which are well-known from diverse purely ferromagnetic systems,
the transverse hysteresis loops exhibit clear asymmetries, similar to exchange
biased systems at low temperatures, and unusual transverse magnetization values
at saturation. Since minor loops and a rotational anisotropy can be excluded in
this case, this asymmetry can possibly be a residue of the exchange bias coupling
at lower temperatures.
article_number: '71'
article_type: original
author:
- first_name: Andrea
full_name: Ehrmann, Andrea
last_name: Ehrmann
- first_name: Tomasz
full_name: Blachowicz, Tomasz
last_name: Blachowicz
date_created: 2021-01-03T17:47:40Z
date_updated: 2021-01-18T15:32:28Z
ddc:
- '620'
department:
- _id: '103'
doi: 10.3390/condmat5040071
file:
- access_level: open_access
content_type: application/pdf
creator: aehrmann
date_created: 2021-01-03T17:47:11Z
date_updated: 2021-01-03T17:47:11Z
file_id: '679'
file_name: _2020_Ehrmann_CondensMatter05_71v2.pdf
file_size: 1118449
relation: main_file
success: 1
file_date_updated: 2021-01-03T17:47:11Z
has_accepted_license: '1'
intvolume: ' 5'
issue: '4'
keyword:
- exchange bias
- rotatable anisotropy
- blocking temperature
- minor loops
- Co/CoO
language:
- iso: eng
oa: '1'
publication: Condensed Matter
publication_identifier:
issn:
- 2410-3896
publication_status: published
quality_controlled: '1'
status: public
title: Asymmetric Hysteresis Loops in Co Thin Films
type: journal_article
user_id: '223776'
volume: 5
year: '2020'
...