DOI: 10.1063/1.1483122. Crossover from in-plane to perpendicular anisotropy in Pt/CoFe/AlOx sandwiches as a function of Al oxidation: A very accurate control of the oxidation of tunnel barriers

Crossover from in-plane to perpendicular anisotropy in Pt/CoFe/AlOx sandwiches as a function of Al oxidation: A very accurate control of the oxidation of tunnel barriers

10.1063/1.1483122

Crossref journal-article

AIP Publishing

Applied Physics Letters (317)

Abstract

By measuring the extraordinary Hall effect on a series of naturally oxidized Pt3 nm/Co90Fe10 0.6 nm/Al tAl samples with 0&lt;tAl&lt;1.2 nm, a first crossover from in-plane to perpendicular magnetic anisotropy is observed when tAl is varied from 0 to 0.2 nm. The CoFe magnetization remains out of plane for 0.2&lt;tAl&lt;0.5 nm. When the Al thickness is further increased, a second crossover back to in plane takes place. In a series of samples in which the Al thickness is kept constant, the same behavior is observed as the time of exposure to an oxygen plasma is varied. The results clearly indicate that the degree of oxidation of Al at the CoFe/AlOx interface has a dramatic effect on the magnetic anisotropy of the transition-metal layer. These sharp crossovers of anisotropy provide a very accurate and convenient way to monitor the oxidation of the tunnel barrier in magnetic tunnel junctions. This technique is also applied to characterize the oxidation kinetics of various ultrathin metallic layers as well as the aging effect in alumina barriers.

Bibliography

Monso, S., Rodmacq, B., Auffret, S., Casali, G., Fettar, F., Gilles, B., Dieny, B., & Boyer, P. (2002). Crossover from in-plane to perpendicular anisotropy in Pt/CoFe/AlOx sandwiches as a function of Al oxidation: A very accurate control of the oxidation of tunnel barriers. Applied Physics Letters, 80(22), 4157â4159.

Authors 8

S. Monso (first)
B. Rodmacq (additional)
S. Auffret (additional)
G. Casali (additional)
F. Fettar (additional)
B. Gilles (additional)
B. Dieny (additional)
P. Boyer (additional)

References 14 Referenced 174

10.1063/1.369932 / J. Appl. Phys. (1999)
10.1109/20.800991 / IEEE Trans. Magn. (1999)
10.1063/1.367861 / J. Appl. Phys. (1998)
10.1063/1.125833 / Appl. Phys. Lett. (2000)
10.1063/1.122747 / Appl. Phys. Lett. (1998)
10.1103/PhysRevB.50.9989 / Phys. Rev. B (1994)
10.1063/1.364599 / J. Appl. Phys. (1997)
10.1143/JPSJ.61.2099 / J. Phys. Soc. Jpn. (1992)
{'key': '2024020322230793700_r8a', 'first-page': '728', 'volume': '17', 'year': '1993', 'journal-title': 'J. Magn. Soc. Jpn.'} / J. Magn. Soc. Jpn. (1993)
10.1063/1.372615 / J. Appl. Phys. (2000)
10.1063/1.355365 / J. Appl. Phys. (1994)
10.1063/1.358478 / J. Appl. Phys. (1994)
{'key': '2024020322230793700_r11'}
10.1016/S0039-6028(97)00054-X / Surf. Sci. (1997)

Dates

Type	When
Created	23 years, 1 month ago (July 26, 2002, 10:23 a.m.)
Deposited	1 year, 7 months ago (Feb. 3, 2024, 5:23 p.m.)
Indexed	2 weeks, 3 days ago (Aug. 19, 2025, 6:48 a.m.)
Issued	23 years, 3 months ago (June 3, 2002)
Published	23 years, 3 months ago (June 3, 2002)
Published Print	23 years, 3 months ago (June 3, 2002)

Funders 0

None

BibTeX

@article{Monso_2002, title={Crossover from in-plane to perpendicular anisotropy in Pt/CoFe/AlOx sandwiches as a function of Al oxidation: A very accurate control of the oxidation of tunnel barriers}, volume={80}, ISSN={1077-3118}, url={http://dx.doi.org/10.1063/1.1483122}, DOI={10.1063/1.1483122}, number={22}, journal={Applied Physics Letters}, publisher={AIP Publishing}, author={Monso, S. and Rodmacq, B. and Auffret, S. and Casali, G. and Fettar, F. and Gilles, B. and Dieny, B. and Boyer, P.}, year={2002}, month=jun, pages={4157–4159} }

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