Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing

Conca A, Niesen A, Reiss G, Hillebrands B (2018)
JOURNAL OF PHYSICS D-APPLIED PHYSICS 51(16): 6.

Zeitschriftenaufsatz | Veröffentlicht | Englisch
 
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Autor*in
Conca, A.; Niesen, AlessiaUniBi; Reiss, GünterUniBi ; Hillebrands, B.
Abstract / Bemerkung
We investigate a series of films with different thickness of the Heusler alloy Co2FeAl in order to study the effect of annealing on the interface with a MgO layer and on the bulk magnetic properties. Our results reveal that while the perpendicular interface anisotropy constant K-S(perpendicular to) is zero for the as-deposited samples, its value increases with annealing up to a value of 1.14 +/- 0.07 mJ m(-2) for the series annealed at 320 degrees C and of 2.01 +/- 0.7 mJ m(-2) for the 450 degrees C annealed series owing to a strong modification of the interface during the thermal treatment. This large value ensures a stabilization of a perpendicular magnetization orientation for an extrapolated thickness below 1.7 nm. The data additionally shows that the in-plane biaxial anisotropy constant has a different evolution with thickness in as-deposited and annealed systems. The Gilbert damping parameter a shows minima for all series for a thickness of 40 nm and an absolute minimum value of 2.8 +/- 0.1 x 10(-3). The thickness dependence is explained in terms of an inhomogeneous magnetization state generated by the interplay between the different anisotropies of the system and by the crystalline disorder.
Stichworte
Heusler; PMA; interface; CFA; perpendicular magnetization; damping; FMR
Erscheinungsjahr
2018
Zeitschriftentitel
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Band
51
Ausgabe
16
Art.-Nr.
6
ISSN
0022-3727
eISSN
1361-6463
Page URI
https://pub.uni-bielefeld.de/record/2919289

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Conca A, Niesen A, Reiss G, Hillebrands B. Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing. JOURNAL OF PHYSICS D-APPLIED PHYSICS. 2018;51(16): 6.
Conca, A., Niesen, A., Reiss, G., & Hillebrands, B. (2018). Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 51(16), 6. doi:10.1088/1361-6463/aab5d8
Conca, A., Niesen, A., Reiss, G., and Hillebrands, B. (2018). Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing. JOURNAL OF PHYSICS D-APPLIED PHYSICS 51:6.
Conca, A., et al., 2018. Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing. JOURNAL OF PHYSICS D-APPLIED PHYSICS, 51(16): 6.
A. Conca, et al., “Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing”, JOURNAL OF PHYSICS D-APPLIED PHYSICS, vol. 51, 2018, : 6.
Conca, A., Niesen, A., Reiss, G., Hillebrands, B.: Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing. JOURNAL OF PHYSICS D-APPLIED PHYSICS. 51, : 6 (2018).
Conca, A., Niesen, Alessia, Reiss, Günter, and Hillebrands, B. “Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing”. JOURNAL OF PHYSICS D-APPLIED PHYSICS 51.16 (2018): 6.

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