Effect of giant magnetoresistance in a symmetric magnetically sandwich

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

“…In magnetically ordered sandwiches as Co/Cu/Co, electrons whose spin direction coincides with the direction of the spontaneous magnetization vector in the magnetic layer of the metal are effective, responsible for the effect (Pippard's concept of "inefficiency" [6]). Such electrons are called majority electrons, and all the last charge carriers are called minority charge carriers (electrons got this name by analogy with the concept of "main" and "non-main" charge carriers in semiconductor physics (note of the translator of the article [13]).…”

“…Such effects include, in particular, the effect of giant magnetoresistance (GMO), which is observed in three-layer (multilayer) films, which consist of magnetic metal layers separated by non-magnetic layers. The thickness of the interlayers is selected in such way that the interaction between the magnetic layers of the metal has an antiferromagnetic character (ap-interaction), as a result the magnetization vectors M in the adjacent metal layers are oriented in in opposite directions [4][5][6]. Placing such structure in a relatively low external magnetic field orients the magnetization vectors M in parallel (p -interaction), which leads either to a significant decrease in the magnetoresistance (MR) of the conductor (negative effect of GMR), or to a significant increase in the MR (positive, the inverse effect of GMR) [7].…”

“…In the theoretical analysis of the GMR effect, phenomenological [3,6], quasi-classical [5,9,10] and quantum mechanical [3] approaches are usually used, which are quite unwieldy. However, you can use the simple theory of Fuchs in the qualitative analysis of the GMR effect, which is the purpose of this report.…”