2013
DOI: 10.1063/1.4808102
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Irradiation-induced tailoring of the magnetism of CoFeB/MgO ultrathin films

Abstract: We study perpendicularly magnetized Ta/CoFeB/MgO films and investigate whether their irradiation with light ions can improve their properties by inducing a different crystallization dynamics. We report the magnetization, anisotropy, g-factor, and damping dependence upon irradiation fluence and discuss their evolutions with collisional mixing simulations and its expected consequence on magnetic properties. We show that after a short irradiation at 100 °C, the anisotropy increases close to the value obtained by … Show more

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Cited by 47 publications
(37 citation statements)
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“…11 A key feature to compare the performance of these films is their saturation magnetization Ms and its uniformity at the local scale. Conventional magnetometry methods like Superconducting Quantum Interference Device (SQUID) or vibrating sample magnetometers (VSMs) can inherently only give the spatial average of the magnetization and are prone to errors due to the parasitic magnetic signals coming from the substrate or the surface contamination.…”
mentioning
confidence: 99%
“…11 A key feature to compare the performance of these films is their saturation magnetization Ms and its uniformity at the local scale. Conventional magnetometry methods like Superconducting Quantum Interference Device (SQUID) or vibrating sample magnetometers (VSMs) can inherently only give the spatial average of the magnetization and are prone to errors due to the parasitic magnetic signals coming from the substrate or the surface contamination.…”
mentioning
confidence: 99%
“…4(a)]. This method enables precise tuning of PMA and magnetization through intermixing at both Ta|CoFeB and CoFeB|MgO interfaces, and can be adjusted by varying the irradiation dose [25,26]. A 1-µm-wide wire of Ta|CoFeB (1 nm)|MgO was irradiated through a mask with He + ions at 15 keV energy with a fluence of 1.6×10 15 ions/cm 2 [11].…”
mentioning
confidence: 99%
“…As a result, CoFeB alloys are usually chosen, 3-5 because they have the relevant properties. 6,7 However intermetallics with greater exchange stiffness and Curie temperature, together with lower magnetization M s and lower damping are desirable. This is first to fully benefit from the interface anisotropy without paying the destabilization cost of the perpendicular demagnetizing field and second, to favor coherent magnetization reversal compared to domain wall mediated reversal.…”
mentioning
confidence: 99%