Justification of the Giant Magnetoresistance Effect in Co/Cu/Co and Fe/Cr/Fe Magneto-Ordered Three-Layer Structures by Using the Fuchs Formula

• Published in: Journal of Nano- and Electronic Physics Vol. 15; no. 1
• Main Authors: Shyshko, N S, Shabelnyk, Yu M, Kolesnichenko, Yu A, Shkurdoda, Yu O, Pronoza, A O, Chornous, A M, Dekhtyaruk, L V
• Format: Journal Article
• Language: English; Russian; Ukrainian
• Published: Sumy Ukraine Sumy State University, Journal of Nano - and Electronic Physics 01.01.2023
• Subjects: Chromium; Cobalt; Conductivity; Copper; Giant magnetoresistance; Iron; Magnetic fields; Magnetoresistivity; Physics; Qualitative analysis; Thickness
• ISSN: 2077-6772; 2306-4277
• DOI: 10.21272/jnep.15(1).01029

The qualitative analysis of the giant magnetoresistive effect in three-layer magnetically ordered films (sandwiches) was carried out using the two-current model and the theory of dimensional effects. It is shown that in the region of small thicknesses of the covering magnetic layer the magnetoresistance of the conductor increases compared to the thickness of the base magnetic layer, while in the opposite region of thicknesses it decreases, and in the specified thickness the effect is negligible due to the presence of the shunt effect. In the case when the thickness of the covering magnetic layer of the metal is proportional to the total thickness of the base magnetic layer and the non-magnetic layer, the value of magnetoresistance reaches its maximum value due to the absence of the shunting effect. It is shown that the insignificant value of the effect is due to the shunting of the resistances of the covering and base magnetic layers. If the thickness of the covering magnetic layer of the metal is comparable to the total thickness of the main magnetic layer and the non-magnetic layer, the value of magnetoresistance reaches its maximum value due to the absence of the shunting effect mentioned above.