Magnetization reversal in GdCo antidot films with perpendicular anisotropy

Influence of nanoscale antidot lattices on magnetization reversal processes in GdCo films with strong perpendicular anisotropy has been investigated. Lattice parameters have been set by choosing substrates prepared by anodizing aluminum foils in appropriate conditions. We have studied the influence of the nanoscale local curvature on magnetization processes by comparing flat antidot films, antidot films with curvature, and continuous films with curvature.This work was supported by the President of Russian Federation grant for young scientists (Contract 14.Y30.18.1891-MK)

ANTIDOT PATTERNED FERRIMAGNETIC Tb-Co THIN FILMS WITH PERPENDICULAR MAGNETIC ANISOTROPY

Patterned films were synthesized by depositing Tb-Co layer onto the different types of anodic alumina substrates: porous as-prepared, porous polished, and backside covered with nanohills. The analysis of combined vibrating sample magnetometry, Kerr microscopy and magnetic force microscopy imaging measurements has allowed us to link macroscopic and local magnetization reversal processes.Работа выполнена при поддержке гранта Президента Российской Федерации для молодых ученых № МК-1891.2018.2

Investigation of Magnetization Reversal in Nanostructured Films Based on the TbCo System

Проведено исследование процессов перемагничивания тонких пленок Ta/Tb29Co71/Ta с различными типами наноструктурированиия. Осаждение магнитного материала производилось на пористую поверхность подложек, барьерный оксидный слой и сплошную подложку. Для всех пленок показано наличие сильной перпендикулярной магнитной анизотропии. Проанализированы процессы перемагничивания и характер доменной структуры для пленок на разных подложках. Для пленок, осажденных на пористые подложки, наблюдалось более чем трехкратное увеличение коэрцитивной силы по сравнению со сплошной и осажденной на барьерный слой пленками, которое сопровождалось уменьшением среднего размера доменов в области коэрцитивной силы.The magnetization reversal of thin Ta/Tb29Co71/Ta films with various types of nano structuring was investigated. The deposition of the magnetic material was carried out on the porous surface of the substrates, the barrier oxide layer and the continuous substrate. The presence of strong perpendicular magnetic anisotropy was shown for all types. The magnetization reversal processes and the character of the domain structure for films on different substrates was analyzed. For films deposited on porous substrates, a more than triple increase in coercivity was observed as compared to a continuous film, which was accompanied by a decrease in the average domain size in the coercivity region

ANALYSIS OF DEMAGNETIZATION PROCESS AND MAGNETIC ANISOTROPY OF A FENI THIN FILM

Investigation of the magnetization reversal of a FeNi thin magnetic film is performed. Magnetic hysteresis loops and angular dependences of both coercivity and remanence are obtained by Kerr magnetometry. An analysis of the above dependences and the dispersion of an easy magnetization axis are described using micromagnetic calculations