Giant Tunneling Magnetoresistance in Graphene/$h$-BN Based van der Waals Magnetic Tunnel Junctions via 3$d$ Transition Metal Intercalation

• URL: http://arxiv.org/abs/2505.04878v1
• Date: Thu, 08 May 2025 01:23:02 GMT
• Title: Giant Tunneling Magnetoresistance in Graphene/$h$-BN Based van der Waals Magnetic Tunnel Junctions via 3$d$ Transition Metal Intercalation
• Authors: Zhi Yan, Jianhua Xiao, Xujin Zhang, Cheng Fang, Xiaohong Xu,
• Abstract summary: We propose a generic strategy for the construction of fully 2D magnetic tunnel junctions based on transition metal-intercalated graphene electrodes with $h$-BN barrier layer.<n>First-principles calculations reveal that intercalation not only stabilizes uniform atomic dispersion via steric hindrance but also induces robust ferromagnetism in graphene.
• Score: 8.567046032871646
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Atomic intercalation offers a powerful route for engineering two-dimensional (2D) materials by precisely tuning interlayer electronic coupling and spin configurations. Here, we propose a generic strategy for the construction of fully 2D magnetic tunnel junctions (MTJs) based on transition metal-intercalated graphene electrodes with $h$-BN barrier layer. First-principles calculations reveal that intercalation not only stabilizes uniform atomic dispersion via steric hindrance but also induces robust ferromagnetism in graphene. Manganese- and vanadium-intercalated systems (Mn-Gr and V-Gr) exhibit exceptional spintronic performance, with tunneling magnetoresistance (TMR) showing a pronounced odd-even oscillation as a function of barrier thickness. A giant TMR of $4.35 \times 10^8\,\%$ is achieved in the Mn-Gr system with a monolayer barrier $h$ -BN ($n=1$), while V-Gr reaches a maximum TMR of $1.86 \times 10^5\,\%$ for a trilayer barrier ($n=3$). Moreover, biaxial strain further enhances the TMR to $10^9\,\%$ and $10^7\,\%$ in Mn-Gr and V-Gr systems, respectively. The devices also exhibit perfect spin filtering and pronounced negative differential resistance, offering new opportunities for high-performance spintronic and memory applications based on 2D van der Waals heterostructures.

Related papers

• High-Field NMR Characterization and Indirect $J$-Spectroscopy of a Nuclear Spin Chain [U-$^{13}$C,$^{15}$N]-butyronitrile [35.29742953849465]
  One-dimensional chains of coupled spins are minimal models of strongly correlated quantum matter.<n>We present [U-$13$C,$15$N]-butyronitrile as a chemically engineered nuclear spin chain.<n>Our results establish [U-$13$C,$15$N]-butyronitrile as an extremely well-characterized spin chain model system.
  arXiv  Detail & Related papers  (2026-02-14T21:35:34Z)
• Quantum Hall Effect at 0.002T [46.680073344221626]
  We demonstrate a significant reduction in external inhomogeneity using a double-layer graphene architecture separated by an ultra-thin hexagonal boron nitride layer.<n>Shubnikov de-Haas oscillations emerge at magnetic fields below 1 mT, while integer quantum Hall features are observed at 0.002T.<n>These results demonstrate the platform's suitability for investigating strongly correlated electronic phases in graphene-based heterostructures.
  arXiv  Detail & Related papers  (2026-01-22T14:40:33Z)
• Magnetic and structural properties of epitaxial Er-substituted yttrium iron garnet films grown by pulsed laser deposition [0.0]
  Er-substituted yttrium iron garnet (Er:YIG) holds the potential of combining the low magnetic damping of YIG with the telecom-band optical transitions.<n>X-ray diffraction, reciprocal space mapping, and scanning transmission electron microscopy confirm single-phase, fully coherent growth with atomically sharp interfaces.
  arXiv  Detail & Related papers  (2025-11-09T10:59:44Z)
• Demonstrating magnetic field robustness and reducing temporal T1 noise in transmon qubits through magnetic field engineering [30.545591782052224]
  Coherence of superconducting transmon qubits is often disrupted by fluctuations in the energy relaxation time (T1)<n>We demonstrate that both trapped magnetic flux and externally applied static magnetic fields can suppress temporal fluctuations in T1 without significantly degrading its average value or qubit frequency.<n>Remarkably, transmon qubits based on tantalum-capped niobium (Nb/Ta) capacitive pads and aluminum-based Josephson junctions (JJs) maintained T1 lifetimes near 300 mus even when cooled in fields as high as 600 mG.
  arXiv  Detail & Related papers  (2025-06-02T19:22:54Z)
• Emergence of Diverse Topological States in Ge Doped MnBi2Te4 [35.56261187819994]
  We investigate the band evolution and topological phase diagram with doping concentration from MTI MnBi2Te4 to strong topological insulator GeBi2Te4.<n>By employing a band momentum mapping method, besides the known MTI phase, remarkably, we find two classes of magnetic Dirac semimetal phases at antiferromagnetic state.<n>The trivial state can be tuned into a Weyl phase with two coexisting band inversions and extraordinarily long Fermi arcs by a small strain.
  arXiv  Detail & Related papers  (2025-05-28T13:30:31Z)
• Quantifying Trapped Magnetic Vortex Losses in Niobium Resonators at mK Temperatures [0.0]
  Trapped magnetic vortices in niobium introduce microwave losses that degrade the performance of superconducting resonators.<n>We isolate flux-induced losses and extract a sensitivity to trapped flux of approximately 2n$Omega$/mG at 10mK and 6GHz.<n>Our results suggest that niobium-based transmon qubits can tolerate vortex-induced dissipation at trapped field levels up to several hundred mG.
  arXiv  Detail & Related papers  (2025-03-18T18:12:36Z)
• High quality superconducting tantalum resonators with beta phase defects [29.026630952383844]
  Coherence of superconducting transmon qubits has been shown to improve by forming qubit capacitor pads from $alpha$-tantalum.<n>We show resonators containing $beta$-phase tantalum in the form of inclusions near the metal-substrate interface with internal quality factors up to $(5.0 pm 2.5) times 106$ in the single photon regime.<n>Our results indicate that small concentrations of $beta$-phase can be beneficial, enhancing critical magnetic fields and potentially, for improving coherence in tantalum based superconducting circuits.
  arXiv  Detail & Related papers  (2025-02-24T15:25:23Z)
• Realization of a doped quantum antiferromagnet with dipolar tunnelings in a Rydberg tweezer array [2.172651378711048]
  We realize a doped quantum antiferromagnet with next-nearest neighbour (NNN) tunnelings $t'$ and hard-core bosonic holes using a Rydberg tweezer platform.<n>We observe dynamical phase separation between hole and spin domains for $|t/J|ll 1$, and demonstrate the formation of repulsively bound hole pairs in a variety of spin backgrounds.
  arXiv  Detail & Related papers  (2025-01-14T16:18:58Z)
• Antiferromagnetic Quantum Anomalous Hall Effect Modulated by Spin Flips and Flops [23.17305544412557]
  We fabricate a device of 7-septuple-layer MnBi2Te4 covered with AlOx capping layer. We uncover a cascade of quantum phase transitions that can be attributed to the influence of spin configurations on charge transport. The versatile tunability of the quantum anomalous Hall effect in MnBi2Te4 paves the way for potential applications in topological antiferromagnetic spintronics.
  arXiv  Detail & Related papers  (2024-05-14T15:08:07Z)
• Flux-Tunable Regimes and Supersymmetry in Twisted Cuprate Heterostructures [39.58317527488534]
  Two Josephson junctions are integrated in a SQuID circuit threaded by a magnetic flux. We show that the flowermon qubit regime is maintained up to a finite critical value of the magnetic field. The interplay between the inherent twisted d-wave nature of the order parameter and the external magnetic flux enables the implementation of different artificial atoms.
  arXiv  Detail & Related papers  (2024-05-06T13:27:19Z)
• Niobium coaxial cavities with internal quality factors exceeding 1.5 billion for circuit quantum electrodynamics [37.74682733310708]
  Group-V materials such as niobium and tantalum have become popular choices for extending the performance of circuit quantum electrodynamics (cQED) platforms. The complex surface chemistry of niobium makes identifying the main modes of decoherence difficult at millikelvin temperatures and single-photon powers. We use niobium coaxial quarter-wave cavities to study the impact of etch chemistry, prolonged atmospheric exposure, and the significance of cavity conditions prior to and during cavities.
  arXiv  Detail & Related papers  (2024-03-01T05:07:10Z)
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals [1.779681639954815]
  We study the effect of altermagnetism on the superconductivity of a two-dimensional metal with d-wave altermagnetism and Rashba spin-orbital coupling. We show that a number of topological superconductors, including both first-order and second-order ones, can emerge when the p-wave pairing dominates.
  arXiv  Detail & Related papers  (2023-05-17T18:00:00Z)
• Spin Current Density Functional Theory of the Quantum Spin-Hall Phase [59.50307752165016]
  We apply the spin current density functional theory to the quantum spin-Hall phase. We show that the explicit account of spin currents in the electron-electron potential of the SCDFT is key to the appearance of a Dirac cone.
  arXiv  Detail & Related papers  (2022-08-29T20:46:26Z)
• Interstitial-induced ferromagnetism in a two-dimensional Wigner crystal [2.0415910628419067]
  Wigner crystal (WC) occurs in strongly interacting regime of 2DEG. Recently, Hossain et al. [PNAS 117 (51) 32244-32250] reported the occurrence of a fully polarized ferromagnetic insulator at $r_s gtrsim 35$ in an AlAs quantum well. Here, we analyze the large $r_s$ dynamics of an interstitial defect in the WC, and show that it produces local ferromagnetism with much higher energy scales.
  arXiv  Detail & Related papers  (2022-06-14T22:41:46Z)
• Operating in a deep underground facility improves the locking of gradiometric fluxonium qubits at the sweet spots [40.52930634139674]
  The gradiometric fluxonium shows two orders of magnitude suppression of sensitivity to homogeneous magnetic fields. We observe unexpectedly short fluxon lifetimes of a few hours, which cannot be explained by thermal or quantum phase slips.
  arXiv  Detail & Related papers  (2022-01-24T16:16:17Z)
• Magnetic-field resilience of 3D transmons with thin-film Al/AlO$_x$/Al Josephson junctions approaching 1 T [0.0]
  We investigate the effect of in-plane magnetic fields up to 1 T on the spectrum and coherence times of thin-film 3D aluminum transmons. Thin-film aluminum Josephson junctions are a suitable hardware for superconducting circuits in the high-magnetic-field regime.
  arXiv  Detail & Related papers  (2021-11-01T17:43:15Z)
• Doping isolated one-dimensional antiferro-magnetic semiconductor Vanadium tetrasulfide ($VS_4$) nanowires with carriers induces half-metallicity [3.5246176704798495]
  Quasi one-dimensional (1D) vanadium tetrasulfide ($VS_4$) nanowires (NWs) are synthetic semiconductors which combine with each other to form bulk phases. We investigate the geometrical, electronic, and magnetic properties of bulk phase and isolated $VS_4$ NWs.
  arXiv  Detail & Related papers  (2021-01-29T15:50:08Z)
• Electrically tuned hyperfine spectrum in neutral Tb(II)(Cp$^{\ m{iPr5}}$)$_2$ single-molecule magnet [64.10537606150362]
  Both molecular electronic and nuclear spin levels can be used as qubits. In solid state systems with dopants, an electric field was shown to effectively change the spacing between the nuclear spin qubit levels. This hyperfine Stark effect may be useful for applications of molecular nuclear spins for quantum computing.
  arXiv  Detail & Related papers  (2020-07-31T01:48:57Z)
• Optimal coupling of HoW$_{10}$ molecular magnets to superconducting circuits near spin clock transitions [85.83811987257297]
  We study the coupling of pure and magnetically diluted crystals of HoW$_10$ magnetic clusters to microwave superconducting coplanar waveguides. Results show that engineering spin-clock states of molecular systems offers a promising strategy to combine sizeable spin-photon interactions with a sufficient isolation from unwanted magnetic noise sources.
  arXiv  Detail & Related papers  (2019-11-18T11:03:06Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.