Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 13, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201900089
Keywords
damping constant; Fe16N2; giant magnetoresistance; perpendicular magnetic anisotropy; spintronic devices
Funding
- DOE ARPA-E rare-earth-free magnet program
- MARCO
- DARPA
- National Science Foundation (NSF) through the National Nanotechnology Infrastructure Network program
- NSF through the Materials Research Science and Engineering Center
- China Scholar Council visiting Program
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Realization of sub-10 nm spin-based logic and memory devices relies on the development of magnetic materials with perpendicular magnetic anisotropy that can provide low switching current and large thermal stability simultaneously. In this work, the authors report on one promising candidate, Fe16N2, a heavy-metal-free, non-interface perpendicular magnetic material and demonstrate a perpendicularly magnetized current-perpendicular-to-plane (CPP) giant magnetoresistance (GMR) device based on Fe16N2. The crystalline-based perpendicular anisotropy of Fe16N2 in the CPP GMR device is measured to be about 1.9 x 10(6) J m(-3) (1.9 x 10(7) erg cm(-3)), which is sufficient to maintain the thermal stability of sub-10 nm devices. A first principle calculation is performed to support this large magnitude of the perpendicular anisotropy. Moreover, the Gilbert damping constant of the Fe16N2 thin film (alpha approximate to 0.01) measured by ferromagnetic resonance (FMR) is lower than for most existing materials with crystalline perpendicular magnetic anisotropy. The non-interface perpendicular anisotropy and low damping properties of Fe16N2 may offer a pathway for future spintronics logic and memory devices.
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