Magnetic Resistance in Magnetically Ordered "Symmetrical" Fα>1/S/Fα>1 and "Asymmetrical" Fα1>1/S/Fα2>1 Sandwiches with Ultra-Thin Layers
| Authors | Yu.M. Shabelnyk1 , Yu.O. Shkurdoda1 , L.V. Dekhtyaruk2 , A.M. Chornous1 , I.I. Slyusarenko2, Yu.A. Kolesnichenko3, D.I. Saltykov4, V.Ye. Yanhol1, T.A. Nalivayko5 |
| Affiliations |
1Sumy State University, 40007 Sumy, Ukraine 2Taras Shevchenko National University of Kyiv, 01601 Kyiv, Ukraine 3B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 61103 Kharkiv, Ukraine 4Sumy State Pedagogical University named after A.S. Makarenko, 40002 Sumy, Ukraine 5Kharkiv National Automobile and Highway University, 61002 Kharkiv, Ukraine |
| Е-mail | y.shabelnyk@aph.sumdu.edu.ua |
| Issue | Volume 18, Year 2026, Number 2 |
| Dates | Received 10 February 2026; revised manuscript received 19 April 2026; published online 29 April 2026 |
| Citation | Yu.M. Shabelnyk, Yu.O. Shkurdoda, et al., J. Nano- Electron. Phys. 18 No 2, 02034 (2026) |
| DOI | https://doi.org/10.21272/jnep.18(2).02034 |
| PACS Number(s) | 75.47.De, 75.70.Cn, 81.40.Rs, 85.70.Kh |
| Keywords | Magnetically ordered systems, Sandwich, Base layer, Shunting effect. |
| Annotation |
Theoretically, using two-current [1] and resistive models [2, 3], the dimensional effects (dependences of the magnetoresistive ratio on the thickness d2 of the top magnetic layer) of giant magnetoresistance in “symmetric” Fa > 1/S/Fa > 1 and “asymmetric” Fa1 > 1/S/Fa2 > 1 sandwiches have been investigated. It is shown that in regions of small (large) values of the thickness d2 of the top magnetic layer relative to the thickness d1 of the bottom magnetic layer, the giant magnetoresistance effect is negligible. This is due to the fact that when the inequalities d2 << d1 (d2 >> d1) hold, the specified effect is small due to the shunting of the resistance of the top layer (the resistance of the base layer) by the resistances of the base magnetic layer and the non-magnetic interlayer (the resistances of the top layer and the spacer). In the absence of the shunting effect, i.e., when the thickness of the top magnetic layer coincides with the total thickness of the spacer and the base magnetic layer, the magnetoresistive ratio reaches its maximum value. Analytical calculations of the parameters of electron spin-polarized transport were performed for both “symmetric” Fa > 1/S/Fa > 1 and “asymmetric” Fa1 > 1/S/Fa2 > 1 magnetically ordered sandwiches with ultrathin layers. |
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List of References |
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