Yazar "Hindmarch, A. T." seçeneğine göre listele

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    Temperature dependence of magnetically dead layers in ferromagnetic thin-films
    (Amer Inst Physics, 2017) Tokaç, Mustafa; Kinane, Christian J.; Atkinson, Darryn; Hindmarch, A. T.
    Polarized neutron reflectometry has been used to study interface magnetism and magnetic dead layers in model amorphous CoFeB: Ta alloy thin-film multilayers with Curie temperatures tuned to be below room-temperature. This allows temperature dependent variations in the effective magnetic thickness of the film to be determined at temperatures that are a significant fraction of the Curie temperature, which cannot be achieved in the material systems used for spintronic devices. In addition to variation in the effective magnetic thickness due to compositional grading at the interface with the tantalum capping layer, the key finding is that at the interface between ferromagnetic film and GaAs(001) substrate local interfacial alloying creates an additional magnetic dead-layer. The thickness of this magnetic dead-layer is temperature dependent, which may have significant implications for elevated-temperature operation of hybrid ferromagnetic metal-semiconductor spintronic devices. (C) 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
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    Threshold interface magnetization required to induce magnetic proximity effect
    (Amer Physical Soc, 2019) Inyang, O.; Bouchenoire, Laurence; Nicholson, Bruce; Tokaç, Mustafa; Rowan-Robinson, Richard; Kinane, Christian; Hindmarch, A. T.
    Proximity-induced magnetization (PIM) has broad implications across interface-driven spintronics applications employing spin currents. We directly determine the scaling between PIM in Pt and the temperature-dependent interface magnetization in an adjacent ferromagnet (FM) using depth-resolved magnetometry. The magnetization due to PIM does not follow the generally expected linear scaling with the FM interface magnetization, as a function of temperature. Instead, it vanishes while the FM interface magnetization remains. The effective magnetic susceptibilities of heavy-metal (HM) layers are shown to give rise to the previously unexplained asymmetric PIM found in HM/FM/HM trilayers.