Complex magnetic ordering in nanoporous [Co/Pd]5-IrMn multilayers with perpendicular magnetic anisotropy and its impact on magnetization reversal and magnetoresistance
| Autor: | Johan Åkerman, Dinh Lam Vu, S. K. Lazarouk, Janusz Przewoźnik, Czesław Kapusta, J. V. Kasiuk, Wen-Bin Wu, Hong Ky Vu, Thanh Huong Nguyen, Thi Ngoc Anh Nguyen, Julia Fedotova, Khanh T. Do, O. V. Kupreeva |
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| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Magnetic moment Magnetoresistance Scattering Nanoporous General Physics and Astronomy Field dependence 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Magnetic field Condensed Matter::Materials Science Ferromagnetism 0103 physical sciences Physical and Theoretical Chemistry Thin film 0210 nano-technology |
| Zdroj: | Physical Chemistry Chemical Physics. 22:3661-3674 |
| ISSN: | 1463-9084 1463-9076 |
| DOI: | 10.1039/c9cp05947d |
| Popis: | We have systematically investigated the magnetization reversal characteristics and magnetoresistance of continuous and nanoporous [Co/Pd]5-IrMn multilayered thin films with perpendicular magnetic anisotropy at different temperatures (4-300 K). For their nanostructuring, porosity was induced by means of deposition onto templates of anodized titania with small (∼30 nm in diameter) homogeneously distributed pores. The magnetization reversal and magnetoresistance of the porous films were found to be closely related to the splitting of the ferromagnetic material into regions with different magnetic properties, in correlation with the complex morphology of the porous system. Independent magnetization reversal is detected for these regions, and is accompanied by its strong impact on the magnetic order in the capping IrMn layer. Electron-magnon scattering is found to be a dominant mechanism of magnetoresistance, determining its almost linear field dependence in a high magnetic field and contributing to its magnetoresistance behavior, similar to magnetization reversal, in a low magnetic field. Partial rotation of IrMn magnetic moments, consistent with the magnetization reversal of the ferromagnet, is proposed as an explanation for the two-state resistance behavior observed in switching between high-resistive and low-resistive values at the magnetization reversal of the porous system studied. |
| Databáze: | OpenAIRE |
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