EFFECTS OF Cu SPACER THICKNESS ON THE INTERLAYER EXCHANGE COUPLING AND MAGNETIC PROPERTIES OF SPIN VALVES  WITH PERPENDICULAR ANISOTROPY  BASED ON [Co/Pd] MULTILAYERED THIN FILMS

Nguyễn Thị Ngọc Anh; Phạm Quang Ngân; Đỗ Khánh Tùng; Nguyễn Thanh Hường; Vũ Hồng Kỳ; Nguyễn Thị Việt Hà; Phạm Thị Thúy Hằng; Đinh Hùng Mạnh

doi:10.34238/tnu-jst.10656

EFFECTS OF Cu SPACER THICKNESS ON THE INTERLAYER EXCHANGE COUPLING AND MAGNETIC PROPERTIES OF SPIN VALVES WITH PERPENDICULAR ANISOTROPY BASED ON [Co/Pd] MULTILAYERED THIN FILMS

About this article

Received: 24/06/24 Revised: 01/08/24 Published: 01/08/24

Authors

1. Nguyen Thi Ngoc Anh , 1) Institute of Materials Science – VAST, 2) Graduate University of Science and Technology – VAST
2. Pham Quang Ngan, Institute of Materials Science – VAST
3. Do Khanh Tung, Institute of Materials Science – VAST
4. Nguyen Thanh Huong, Institute of Materials Science – VAST
5. Vu Hong Ky, Institute of Materials Science – VAST
6. Nguyen Thi Viet Ha, Hanoi National University of Education
7. Pham Thi Thuy Hang, Hanoi National University of Education
8. Dinh Hung Manh, Hanoi National University of Education

Abstract

Spin-valve sandwiched structures (consisting of two ferromagnetic layers with a non-magnetic layer in between) play a significant role in many magnetic applications and modern spintronics technology. In this study, we focus on fabricating spin valve structures in which the ferromagnetic layers are [Co/Pd] multilayer films with perpendicular magnetic anisotropy and the separating layer is Cu with different thicknesses (t_Cu=0.6-6 nm). The effect of Cu layer thickness on magnetic properties in the developed spin valves are investigated in detail. The spin valves are fabricated using a magnetron sputtering system, structural characteristics are investigated by X-ray diffraction, and magnetic properties are investigated by a vibrating sample magnetometer system. The results show that the exchange interaction between ferromagnetic layers as well as the magnetic properties in spin valves clearly depends on the thickness of the Cu spacer. The research opens up the possibility of designing and optimizing perpendicular spin valves for next-generation spintronics devices.

Keywords

Magnetic multilayered thin films; Perpendicular magnetic anisotropy; Spin valve; Giant magnetoresistance; RKKY interaction

Full Text:

PDF (Tiếng Việt)

References

[1] M. N. Baibich, J. M. Broto, A. Fert, et al., "Giant magnetoresistance of (001)Fe/(001)Cr magnetic superlattices," Physical Review Letters, vol. 61, p. 2472, 1988.

[2] G. Binasch, P. Grünberg, F. Saurenbach, and W. Zinn, "Enhanced magnetoresistance in layered magnetic structures with antiferromagnetic interlayer exchange," Physical Review B, vol. 39, p. 4828, 1989.

[3] B. Dieny, V. S. Speriosu, S. S. P. Parkin, et al., "Giant magnetoresistive in soft ferromagnetic multilayers," Physical Review B, vol. 43, p. 1297, 1991.

[4] C. Safranski, E. A. Montoya, and I. N. Krivorotov, "Spin–orbit torque driven by a planar Hall current," Nature Nanotechnology, vol. 14, no. 1, pp. 27-30, 2019.

[5] R. Mardani, "Fabrication of FM/NM/FM hetero-structure multilayers and investigation on structural and magnetic properties: application in GMI magnetic sensors," J. Supercond. Nov. Magn., vol. 33, pp. 503-509, 2020.

[6] M. L. Pankratova and A. S. Kovalev, "Model of exchange bias in a trilayer FM/AFM/FM structure," Low Temperature Physics, vol. 41, pp. 838-844, 2015.

[7] T. Kasuya, "A theory of metallic ferro- and antiferromagnetism on Zener's model," Progress of Theoretical Physics, vol. 16, no. 1, pp. 45–57, 1956.

[8] M. A. Ruderman and C. Kittel, "Indirect Exchange Coupling of Nuclear Magnetic Moments by Conduction Electrons," Physical Review, vol. 96, p. 99, 1954.

[9] K. Yosida, "Magnetic Properties of Cu-Mn Alloys," Physical Review, vol. 106, p. 893, 1957.

[10] P. Bruno and C. Chappert, "Ruderman-Kittel theory of oscillatory interlayer exchange coupling," Physical Review B, vol. 46, p. 261, 1992.

[11] S. S. P. Parkin, "Systematic variation of the strength and oscillation period of indirect magnetic exchange coupling through the 3d, 4d, and 5d transition metals," Physical Review Letters, vol. 67, p. 3598, 1991.

[12] Y. Pennec, J. Camarero, J. C. Toussaint, et al., "Switching-mode-dependent magnetic interlayer coupling strength in spin valves and magnetic tunnel junctions," Physical Review B, vol. 69, p. 180402, 2004.

[13] R. Coehoorn, M. T. Johnson, W. Folkerts, S. T. Purcell, N. W. E. McGee, A. D. Veirman, and P. J. H. Bloemen, “Oscillatory Interlayer Exchange Interaction and Magnetoresistance in Co/Cu and Fe/Cu Systems,” Magnetism and Structure in Systems of Reduced Dimension, NATO ASI Series, Springer, vol. 309, pp. 295-308, 1993.

[14] J. X. Li, M. W. Jia, L. Sun, et al., "Oscillatory Anisotropic Magnetoresistance Arising From Quantum Well States in Au/Fe(001) Bilayers," IEEE Magnetics Letters, vol. 6, pp. 1-4, 2015.

[15] H. A. Wierenga, W. D. Long, M. W. J. Prins, et al., "Interface magnetism and possible quantum well oscillations in ultrathin Co/Cu films observed by magnetization induced second harmonic generation," Physical Review Letters, vol. 74, no. 8, pp. 1462-1465, 1995.

[16] W. Weber, C. H. Back, A. Bischof, C. Würsch, and R. Allenspach, "Morphology-Induced Oscillations of the Magnetic Anisotropy in Ultrathin Co Films," Physical Review Letters, vol. 76, p. 1940, 1996.

[17] C. D. Stanciu, F. Hansteen, A. V. Kimel, et al., "All-Optical Magnetic Recording with Circularly Polarized Light," Physical Review Letters, vol. 99, p. 47601, 2007.

[18] T. Li, A. Patz, L. Mouchliadis, J. Yan, et al., "Femtosecond switching of magnetism via strongly correlated spin-charge quantum excitations," Nature, vol. 496, pp. 69-73, 2013.

[19] T. T. H. Cao, H. K. Vu, T. T. T. Nguyen, T. H. Nguyen, et al., “Tailoring perpendicular magnetic anisotropy in [Co/Pd] multilayers,” (in Vietnamese), Journal of Military Science and Technology, vol. 66, no. 4, pp. 173-177, 2020.

[20]. W.-B Wu, J. Kasiuk, J. Przewoźnik, et al., “Fundamentally Different Magnetoresistance Mechanisms in Related Co/Pd and Co/Pt Multilayers for Spintronic Applications,” Materials Transactions, vol. 64, no. 9, pp. 2124-2127, 2023.

[21] S. Tsunashima, M. Hasegawa, K. Nakamura, and S. Uchiyama, "Perpendicular magnetic anisotropy and coercivity of Pd/Co and Pt/Co multilayers with buffer layers," Journal of Magnetism and Magnetic Materials, vol. 93, pp. 465-468, 1991.

DOI: https://doi.org/10.34238/tnu-jst.10656

Refbacks

There are currently no refbacks.



Remember me