Ferromagnetic resonance study of the epitaxial VN/Pd0.96Fe0.04 thin film heterostructure on MgO substrate

Esmaeili, A.; Mohammed, Wael M.; Yanilkin, I. V.; Gumarov, A.I.; Vakhitov, I. R.; Gabbasov, B. F.; Kiiamov, Airat; Aliyev, M. N.; Yusupov, R. V.; Тагиров, Л. Р.

doi:10.26907/mrsej-19407

Cited by 4 publications

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“…The magnetic proximity effects in YBa 2 Cu 3 O 7 /La 1 − x Ca x MnO 3 interfaces are complex and depend on many impact factors, such as the electronic state of magnetic layers (26), the thickness of SC layer (29), nonhomogeneous domain structures (23)(24), etc. Besides, the S/F heterointerfaces composed of superconducting VN and ferromagnetic alloy Pd 0.96 Fe 0.04 had been investigated (31)(32)(33). The observed suppression of transition temperature, broadening of transition width, and spin-valve properties in S/F heterostructures suggests the promise applications for superconducting spintronics.…”

Section: Introductionmentioning

confidence: 99%

“…The superconducting transition temperature (T C ) of the VN single lm is ~ 7.78 K and is suppressed by ~ 1.55 K after capping a ferromagnetic Fe 3 N layer. This effect is typically attributed to the presence of spin-polarized quasiparticles at the interface, which can enhance the scattering of the Cooper pairs responsible for superconductivity (31)(32)(33). Temperature-dependent resistivity of the two samples were recorded under different magnetic elds, both parallel and perpendicular to the sample's surface plane, up to 9 T (Extended data Fig.…”

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confidence: 99%

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Unconventional syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Jin

Zhang²,

Bai

et al. 2023

Preprint

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The magnetic correlations at the superconductor/ferromagnet (S/F) interfaces play a crucial role in realizing dissipation-less spin-based logic and memory technologies, such as triplet-supercurrent spin-valves and "π" Josephson junctions. Here we report the coexistence of an induced large magnetic moment and a cryptoferromagnetic state at high-quality nitride S/F interfaces. Using polarized neutron reflectometry and d. c. SQUID measurements, we quantitatively determined the magnetization profile of S/F bilayer and confirmed the induced magnetic moment in the adjacent superconductor only exists below TC. Interestingly, the direction of the induced moment in the superconductors was unexpectedly parallel to that in the ferromagnet, which contrasts with earlier findings in S/F heterostructures based on metals or oxides. First-principles calculations verified that the unusual interfacial spin texture observed in our study was caused by the Heisenberg direct exchange coupling with constant J ~ 4.28 meV through d-orbital overlapping and severe charge transfer across the interfaces. Our work establishes an incisive experimental probe for understanding the magnetic proximity behavior at S/F interfaces and provides a prototype epitaxial “building block” for superconducting spintronics. Teaser: The superconducting nitrides exhibited an unexpectedly large magnetic moment and cryptoferromagnetism when brought into proximity with a strong ferromagnet.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Unconventional syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Jin

Zhang²,

Bai

et al. 2023

Preprint

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“…Following the development of a way to grow single-crystalline, magnetically homogeneous epitaxial Pd 1−x Fe x films on MgO(001) single-crystalline substrates [33], we propose fully epitaxial Pd 1−x Fe x /VN and VN/Pd 1−x Fe x (x ≤ 0.08) building blocks as an alternative choice for superconducting MRAM materials, in which vanadium nitride (VN) serves as the supercon-ductor. The magnetic anisotropies of a 20 nm thick Pd 0.96 Fe 0.04 film of the first-generation epitaxial sample of VN/Pd 0.96 Fe 0.04 on MgO(001) were studied by using a ferromagnetic resonance technique in [34].…”

Section: Introductionmentioning

confidence: 99%

Epitaxial growth and superconducting properties of thin-film PdFe/VN and VN/PdFe bilayers on MgO(001) substrates

Mohammed

Yanilkin

Gumarov

et al. 2020

Beilstein J. Nanotechnol.

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Single-layer vanadium nitride (VN) and bilayer Pd0.96Fe0.04/VN and VN/Pd0.92Fe0.08 thin-film heterostructures for possible spintronics applications were synthesized on (001)-oriented single-crystalline magnesium oxide (MgO) substrates utilizing a four-chamber ultrahigh vacuum deposition and analysis system. The VN layers were reactively magnetron sputtered from a metallic vanadium target in Ar/N2 plasma, while the Pd1− x Fe x layers were deposited by co-evaporation of metallic Pd and Fe pellets from calibrated effusion cells in a molecular beam epitaxy chamber. The VN stoichiometry and Pd1− x Fe x composition were controlled by X-ray photoelectron spectroscopy. In situ low-energy electron diffraction and ex situ X-ray diffraction show that the 30 nm thick single-layer VN as well as the double-layer VN(30 nm)/Pd0.92Fe0.08(12 nm) and Pd0.96Fe0.04(20 nm)/VN(30 nm) structures have grown cube-on-cube epitaxially. Electric resistance measurements demonstrate a metallic-type temperature dependence for the VN film with a small residual resistivity of 9 μΩ·cm at 10 K, indicating high purity and structural quality of the film. The transition to the superconducting state was observed at 7.7 K for the VN film, at 7.2 K for the Pd0.96Fe0.04/VN structure and at 6.1 K for the VN/Pd0.92Fe0.08 structure with the critical temperature decreasing due to the proximity effect. Contrary to expectations, all transitions were very sharp with the width ranging from 25 mK for the VN film to 50 mK for the VN/Pd0.92Fe0.08 structure. We propose epitaxial single-crystalline thin films of VN and heteroepitaxial Pd1− x Fe x /VN and VN/Pd1− x Fe x (x ≤ 0.08) structures grown on MgO(001) as the materials of a choice for the improvement of superconducting magnetic random access memory characteristics.

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“…Particular bilayer samples formed by the vanadium nitride and the Pd 1−x Fe x alloy on MgO(001) were grown in the course of developing the approach to the synthesis of such heterostructures: MgO(001)/VN/Pd 0.96 Fe 0.04 was studied in [ 49 ] with a focus at the magnetic anisotropy of epitaxial Pd 0.96 Fe 0.04 on VN; MgO(001)/Pd 0.96 Fe 0.04 /VN and MgO(001)/VN/Pd 0.92 Fe 0.08 bilayers were investigated in [ 50 ] with the focus on their electrical properties. In this work, we aimed to synthesize fully epitaxial, three-layer pseudo-spin-valve (spin-valve without exchange bias, but with different coercivities of the functional ferromagnetic layers) heterostructure MgO(001)/Pd 0.96 Fe 0.04 (20 nm)/VN(30 nm)/Pd 0.92 Fe 0.08 (12 nm).…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Magnetoresistive Properties of the Epitaxial Pd0.96Fe0.04/VN/Pd0.92Fe0.08 Superconducting Spin-Valve Heterostructure

et al. 2020

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A thin-film superconductor(S)/ferromagnet(F) F1/S/F2-type Pd0.96Fe0.04(20 nm)/VN(30 nm)/Pd0.92Fe0.08(12 nm) heteroepitaxial structure was synthesized on (001)-oriented single-crystal MgO substrate utilizing a combination of the reactive magnetron sputtering and the molecular-beam epitaxy techniques in ultrahigh vacuum conditions. The reference VN film, Pd0.96Fe0.04/VN, and VN/Pd0.92Fe0.08 bilayers were grown in one run with the target sample. In-situ low-energy electron diffraction and ex-situ X-ray diffraction investigations approved that all the Pd1−xFex and VN layers in the series grew epitaxial in a cube-on-cube mode. Electric resistance measurements demonstrated sharp transitions to the superconducting state with the critical temperature reducing gradually from 7.7 to 5.4 K in the sequence of the VN film, Pd0.96Fe0.04/VN, VN/Pd0.92Fe0.08, and Pd0.96Fe0.04/VN/Pd0.92Fe0.08 heterostructures due to the superconductor/ferromagnet proximity effect. Transition width increased in the same sequence from 21 to 40 mK. Magnetoresistance studies of the trilayer Pd0.96Fe0.04/VN/Pd0.92Fe0.08 sample revealed a superconducting spin-valve effect upon switching between the parallel and antiparallel magnetic configurations, and anomalies associated with the magnetic moment reversals of the ferromagnetic Pd0.92Fe0.08 and Pd0.96Fe0.04 alloy layers. The moderate critical temperature suppression and manifestations of superconducting spin-valve properties make this kind of material promising for superconducting spintronics applications.

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Ferromagnetic resonance study of the epitaxial VN/Pd0.96Fe0.04 thin film heterostructure on MgO substrate

Cited by 4 publications

References 0 publications

Unconventional syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Unconventional syntropic spin alignment at the interface between ferromagnetic and superconducting nitrides

Epitaxial growth and superconducting properties of thin-film PdFe/VN and VN/PdFe bilayers on MgO(001) substrates

Synthesis, Characterization, and Magnetoresistive Properties of the Epitaxial Pd0.96Fe0.04/VN/Pd0.92Fe0.08 Superconducting Spin-Valve Heterostructure

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