Study on the domain structure and tunable spin orientation in L11-CoPt/NiFe exchange springs with Ta-spacer

Saravanan, P.; Talapatra, A.; Mohanty, J.; Boominathasellarajan, S.; Hsu, Jen‐Hwa

doi:10.1016/j.jmmm.2017.08.003

Cited by 1 publication

(2 citation statements)

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“…Determination of the depth profile of the magnetization requires more sophisticated techniques such as polarized neutron reflectometry or X-ray resonant magnetic reflectivity . Although simulations of the hysteresis loops can provide some insight, crude assumptions are often needed to estimate the tilting angle of the magnetization; therefore, it is difficult to account for effects associated with the formation of a domain structure. As shown previously for [Co/Pd]/NiFe, directly coupled hard and soft sub-units result in magnetic hybrid structures with unique properties, such as imprinted magnetization textures and three-dimensional canting of the magnetization through the thickness of the structure, which would not occur in single-layer films.…”

Section: Resultsmentioning

confidence: 99%

“…The most well-explored out-of-plane ES structures are composed of two sub-units, one with perpendicular anisotropy such as multilayered [Co/Pd] ,,, or a L1 1 -CoPt layer − and the other with a small in-plane anisotropy (usually NiFe). However, studies have been mostly limited to static magnetic properties so far, and further experiments providing insights into the magnetization dynamics are highly desirable.…”

Section: Introductionmentioning

confidence: 99%

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Optically and Microwave-Induced Magnetization Precession in [Co/Pt]/NiFe Exchange Springs

Dąbrowski

Frisk

Burn

et al. 2020

ACS Appl. Mater. Interfaces

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Microwave and heat assisted magnetic recording are two competing technologies that have greatly increased the capacity of hard disk drives. The efficiency of the magnetic recording process can be further improved by employing non-collinear spin structures that combine perpendicular and in-plane magnetic anisotropy. Here, we investigate both microwave and optically excited magnetization dynamics in [Co/Pt]/NiFe exchange spring samples. The resulting canted magnetization within the nanoscale [Co/Pt]/NiFe interfacial region allows for optically stimulated magnetization precession to be observed for an extended magnetic field and frequency range. The results can be explained by formation of an imprinted domain structure, which locks the magnetization orientation and makes the structures more robust against external perturbations. Tuning the canted interfacial domain structure may provide greater control of optically excited magnetization reversal and optically generated spin currents, which are of paramount importance for future ultrafast magnetic recording and spintronic applications.

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Section: Resultsmentioning

confidence: 99%