Tunneling magnetoresistance in ensembles of ferromagnetic granules with exchange interaction and random easy axes of magnetic anisotropy

Autor:	Beltukov, Y. M., Kozub, V. I., Shumilin, A. V., Stepina, N. P.
Rok vydání:	2020
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics
Druh dokumentu:	Working Paper
DOI:	10.1088/1361-648X/abd053
Popis:	We study the tunneling magnetoresistance in the ensembles of ferromagnetic granules with random easy axes of magnetic anisotropy taking into account the exchange interaction between granules. It is shown that due to the exchange interaction magnetoresistance is effectively decoupled from magnetization, i.e. the strongest negative magnetoresistance can be observed at the field where magnetization is almost saturated. Under some conditions, the sign of magnetoresistance can be reversed and tunneling magnetoresistance can become positive at certain magnetic fields. Our theory agrees with measurements of magnetoresistance in ensembles of Fe granules in SiCxNy matrix. Comment: To be published in Journal of Physics: Condensed Matter
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2012.07114 Zobrazit plný text záznamu View this record from Arxiv