Journal
APPLIED PHYSICS LETTERS
Volume 105, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4893569
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Funding
- U.S. National Science Foundation at UCD [DMR-1007891, ECCS-0925626]
- Deutsche Forschungsgemeinschaft at HZDR [FA 314/3-2]
- Office of Science, Office of Basic Energy Sciences of the U.S. Department of Energy [DEAC02-05CH11231]
- Grants-in-Aid for Scientific Research [25420295] Funding Source: KAKEN
- Direct For Mathematical & Physical Scien [1008791] Funding Source: National Science Foundation
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1232275] Funding Source: National Science Foundation
- Division Of Materials Research [1008791] Funding Source: National Science Foundation
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The tunability of Ar+ ion irradiation of Co/Pd multilayers has been employed to create depth-dependent perpendicular anisotropy gradients. By adjusting the Ar+ kinetic energy and fluence, the depth and lateral density of the local structural modification are controlled. First-order reversal curve analysis through X-ray magnetic circular dichroism and conventional magnetometry studies shows that the local structural damage weakens the perpendicular anisotropy near the surface, leading to a magnetization tilting towards the in-plane direction. The ion irradiation method is complementary to and may be used in conjunction with, other synthesis approaches to maximize the anisotropy gradient. (C) 2014 AIP Publishing LLC.
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