We have systematically studied magnetotransport properties in van der Waals (vdW) magnetic materials, (Fe1−xCox)5GeTe2, where the magnetic phase changes from the ferromagnetic with the perpendicular magnetic anisotropy (PMA; x = 0 , 0.05) or with the in-plane magnetic anisotropy (IMA; x = 0.19) to the antiferromagnetic (x = 0.46) with the PMA. We have demonstrated that such magnetic properties seen in bulk still remain even in thin film devices. An anomalous Hall resistance with magnetic hysteresis was clearly observed in the low Co substitution ( x = 0 , 0.05). The anomalous Hall effect was still observable for x = 0.19, but the magnetic hysteresis vanishes because of the IMA. In the antiferromagnetic region, there was no anomalous Hall effect in the low magnetic field range, but a clear hysteresis was observed at 2.5 T where the spin–flop transition takes place. This hysteresis can be seen only below 30 K and monotonically decreases with increasing temperature. We argue that the defects at a specific site in this system and also the resistance upturn below 30 K could be related to the hysteric behavior at the spin–flop transition. Our findings provide a recipe for the use of (Fe1−xCox)5GeTe2 with different Co substitutions to construct vdW magnetic devices.
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Enhancement of spin–flop-induced magnetic hysteresis in van der Waals magnet (Fe1−xCox)5GeTe2
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10 April 2023
Research Article|
April 10 2023
Enhancement of spin–flop-induced magnetic hysteresis in van der Waals magnet (Fe1−xCox)5GeTe2
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Tomoharu Ohta
;
Tomoharu Ohta
a)
(Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Validation, Visualization, Writing – original draft, Writing – review & editing)
1
Department of Physics, Graduate School of Science, Osaka University
, Toyonaka, Osaka 560-0043, Japan
a)Author to whom correspondence should be addressed: [email protected]
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Kaito Kurokawa
;
Kaito Kurokawa
(Data curation, Formal analysis, Investigation, Methodology, Software, Writing – review & editing)
1
Department of Physics, Graduate School of Science, Osaka University
, Toyonaka, Osaka 560-0043, Japan
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Nan Jiang
;
Nan Jiang
(Methodology, Writing – review & editing)
1
Department of Physics, Graduate School of Science, Osaka University
, Toyonaka, Osaka 560-0043, Japan
2
Center for Spintronics Research Network, Osaka University
, Toyonaka, Osaka 560-8531, Japan
3
Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
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Kohei Yamagami
;
Kohei Yamagami
(Resources, Writing – review & editing)
4
Okinawa Institute of Science and Technology Graduate University
, Okinawa 904-0495, Japan
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Yoshinori Okada
;
Yoshinori Okada
(Resources, Writing – review & editing)
4
Okinawa Institute of Science and Technology Graduate University
, Okinawa 904-0495, Japan
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Yasuhiro Niimi
Yasuhiro Niimi
b)
(Conceptualization, Funding acquisition, Methodology, Project administration, Supervision, Writing – original draft, Writing – review & editing)
1
Department of Physics, Graduate School of Science, Osaka University
, Toyonaka, Osaka 560-0043, Japan
2
Center for Spintronics Research Network, Osaka University
, Toyonaka, Osaka 560-8531, Japan
3
Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
Search for other works by this author on:
Tomoharu Ohta
1,a)
Kaito Kurokawa
1
Nan Jiang
1,2,3
Kohei Yamagami
4
Yoshinori Okada
4
Yasuhiro Niimi
1,2,3,b)
1
Department of Physics, Graduate School of Science, Osaka University
, Toyonaka, Osaka 560-0043, Japan
2
Center for Spintronics Research Network, Osaka University
, Toyonaka, Osaka 560-8531, Japan
3
Institute for Open and Transdisciplinary Research Initiatives, Osaka University
, Osaka 565-0871, Japan
4
Okinawa Institute of Science and Technology Graduate University
, Okinawa 904-0495, Japan
a)Author to whom correspondence should be addressed: [email protected]
b)
Electronic mail: [email protected]
Appl. Phys. Lett. 122, 152402 (2023)
Article history
Received:
January 06 2023
Accepted:
March 20 2023
Citation
Tomoharu Ohta, Kaito Kurokawa, Nan Jiang, Kohei Yamagami, Yoshinori Okada, Yasuhiro Niimi; Enhancement of spin–flop-induced magnetic hysteresis in van der Waals magnet (Fe1−xCox)5GeTe2. Appl. Phys. Lett. 10 April 2023; 122 (15): 152402. https://doi.org/10.1063/5.0141495
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