Quenching and temperature dependence of perpendicular magnetic anisotropy of Pt/Co multilayers

Yonggang Xu; Xiaolin Zhao; Meng Lv; Guolin Yu; Ning Dai; Junhao Chu

doi:10.1117/12.2179671

13 April 2015 Quenching and temperature dependence of perpendicular magnetic anisotropy of Pt/Co multilayers

Yonggang Xu, Xiaolin Zhao, Meng Lv, Guolin Yu, Ning Dai, Junhao Chu

Proceedings Volume 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II; 952212 (2015) https://doi.org/10.1117/12.2179671
Event: Selected Proceedings of the Photoelectronic Technology Committee Conferences held August-October 2014, 2014, China, China

Abstract

Magnetic metallic multilayers separated by nonmagnetic metal films are of great importance in magnetoelectronics and spintronics, due to their capacity of giving rise to giant magneto-resistance as well as the electric field control of ferromagnetism. Co/Pt multilayers are one of the typical platforms that own perpendicular magnetic anisotropy which can be tuned in various ways. Since previous investigations focus on the anomalous Hall(transverse) resistivity which characterizes the magnetization of the multilayers, much less attention has been paid to the longitudinal resistivity. In this work, we find that the longitudinal resistivity also gives rich phenomena that need further theoretical treatment. We have grown two Co/Pt multilayer structures that have different spacings between neighboring ferromagnetic layers. The one with smaller spacing shows a superparamagnetic behavior in its Hall resistivity even at a temperature as low as 1.5 K, but the longitudinal resistivity shows a well established hysteresis. The other sample shows square hysteresis in the Hall resistivity at all available temperatures up to 300 K, while the longitudinal resistivity gives no significant signals because they are mostly engulfed in the noises. The corresponding temperature dependence of the coercive field are also different. While the former gives an approximately exponential function of the temperature T, the latter can be divided to two zones, each of which can be characterized by a lnT^s dependence, where s is not necessarily an integer. Such distinct features may be deeply related to the microstructures as well as the magnon scattering, which require further investigations.

Citation Download Citation

Yonggang Xu, Xiaolin Zhao, Meng Lv, Guolin Yu, Ning Dai, and Junhao Chu "Quenching and temperature dependence of perpendicular magnetic anisotropy of Pt/Co multilayers", Proc. SPIE 9522, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics 2014, Part II, 952212 (13 April 2015); https://doi.org/10.1117/12.2179671

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KEYWORDS

Magnetism

Multilayers

Anisotropy

Platinum

Scattering

Ferromagnetics

Magnons

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