Tunnel magnetoresistance in magnetic tunnel junctions with embedded nanoparticles

Autor:	Useinov, Arthur, Useinov, Niazbeck, Ye, Lin-Xiu, Wu, Te-Ho, Lai, Chih-Huang
Rok vydání:	2015
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science Physics - Computational Physics Quantum Physics
Druh dokumentu:	Working Paper
DOI:	10.1109/TMAG.2015.2451705
Popis:	In this paper, we attempt the theoretical modeling of the magnetic tunnel junctions with embedded magnetic and nonmagnetic nanoparticles (NPs). A few abnormal tunnel magnetoresistance (TMR) effects, observed in related experiments, can be easily simulated within our model: we found, that the suppressed TMR magnitudes and the TMR sign-reversing effect at small voltages are related to the electron momentum states of the NP located inside the insulating layer. All these TMR behaviors can be explained within the tunneling model, where NP is simulated as a quantum well (QW). The coherent (direct) double barrier tunneling is dominating over the single barrier one. The origin of the TMR suppression is the quantized angle transparency for spin polarized electrons being in one of the lowest QW states. The phenomenon was classified as the quantized conductance regime due to restricted geometry. Comment: 4 pages, 5 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1511.07561 Zobrazit plný text záznamu View this record from Arxiv