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Epitaxial thin-film Pd_(1-x)fe_(x) alloy: a tunable ferromagnet for superconducting spintronics

Science China Materials 2021年第5期64卷 1246-1255页

作者： Alireza Esmaeili Igor V.Yanilkin Amir I.Gumarov Iskander R.Vakhitov bulat f.gabbasov Roman V.Yusupov Dmitriy A.Tatarsky Lenar R.Tagirov Institute of Physics Kazan Federal UniversityKazan 420008Russia Institute for Physics of Microstructures of RAS Nizhny Novgorod 603950Russia Zavoisky Physical-Technical Institute FRC Kazan Scientific Center of RASKazan 420029Russia

Thin epitaxial films of the palladium-rich Pd_(1-x)fe_(x) alloy were synthesized and extensively studied as a tunable ferromagnetic material for superconducting spintronics. The(001)-oriented Mg O single-crystal substrate and the composition range of x = 0.01–0.07 were chosen to support the epitaxial growth and provide the films with magnetic properties spanning from very soft ferromagnet for memory applications to intermediately soft and moderately hard for the programmable logic and circuit biasing, respectively. Dependences of the saturation magnetization, Curie temperature and three magnetic anisotropy constants on the iron content x were obtained for the first time from the analyses of the magnetometry and ferromagnetic resonance data. The experimental results were discussed based on existing theories of dilute ferromagnetic alloys. Simulation of the hysteresis loops within the Stoner-Wohlfarth model indicates the predominant coherent magnetic moment rotation at cryogenic temperatures. The obtained results were compiled in a database of magnetic properties of a palladium-iron alloy in a single-crystal thin-film form considered as a material for superconducting spintronics.

关键词： alloy ferromagnetic palladium

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Dipolar NMR relaxation of adsorbates on surfaces of controlled wettability

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Magnetic Resonance Letters 2023年第3期3卷 220-231,I0003页

作者： Siegfried Stapf Igor Shikhov Christoph Arns bulat Gizatullin Carlos Mattea Department of Technical Physics II University of Technology IlmenauPO Box 10056598684IlmenauGermany School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW2052Australia

In reservoir rocks,the term“ageing”refers to extended exposition to crude oil;a typically water-wet sandstone will then gradually become oil-wet as a consequence of the deposition of insoluble fractions of oil onto the surface *** have been aged artificially by subjecting them to a bitumen solution at elevated temperature in order to achieve comparable surface properties for three different types of rock:Bentheimer,Berea Buff and Liege *** saturated and aromatic model compounds as proxies for crude oil,the nuclear magnetic resonance(NMR)relaxation dispersion in native and aged rocks was compared and correlated to the properties of paramagnetic impurities in these rock *** liquids were found to follow the same trend as deuterated and naturally occurring oil components,suggesting they can be used as suitable tracers for wettability studies since the ^(19)f nucleus is absent in natural *** combining electron paramagnetic resonance(EPR)and dynamic nuclear polarization(DNP)it becomes possible to identify and quantify the origin of the dominating relaxation processes between native and aged rocks,providing an alternative approach to assess wettability in natural rocks.

关键词： Rocks Wettability Relaxometry NMR DNP Oil

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