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À.Ì. KASUMOV, À.I. DMITRIEV, K.A. KOROTKOV, V.M. KARAVAIEVA, and A.I. IEVTUSHENKO

The Estimating Method for the Enhancement of the Magnetization in the Fe/Gd2O3 Nanostructure Resulting from the f–d-Exchange Interaction
785–791 (2024)

PACS numbers: 68.37.Hk, 73.40.Gk, 73.43.Qt, 75.47.-m, 75.50.Tt, 75.70.-i, 81.40.Rs

The tunnelling magnetoresistance (TMR) effect in Fe/Gd2O3 nanostructure consisting of Fe island film deposited on Gd2O3 layer is investigated. In Fe, Co, Ni/rare earth metals (REM) oxide nanostructures, an exchange f–d interaction occurs in the region of their interface due to wave-functions’ hybridization of f- and d-electrons with unfilled shells. This leads to an additional magnetization Mf–d and effective magnetic field Hf–d corresponding to it. The practical value of this enhancement of magnetic properties is that it is achieved in a nanoscale volume without the use of energy or amplification devices. For nanotechnology applications, this fact is important. A method is proposed to determine Hf–d and Mf–d based on the study of TMR(H) dependence, information about which is lacking. The hybridization propagation region in the Fe/Gd2O3 structure is shown to extend at least 70 nm deep in the REM oxide layer

KEY WORDS: tunnelling magnetoresistance, Fe, rare earth metals’ oxide, exchange f–d interaction

DOI:  https://doi.org/10.15407/nnn.22.04.785

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