Optimal design of nanomagnets for on-chip field gradients
arXiv:2212.13156 · doi:10.1103/PhysRevApplied.20.044062
Abstract
The generation of localized magnetic field gradients by on-chip nanomagnets is important for a variety of technological applications, in particular for spin qubits. To advance beyond the empirical design of these nanomagnets, we propose a systematic and general approach based on the micromagnetic formulation of an optimal field gradient source. We study the different field configurations that can be realized and find out quantitatively the most suitable ferromagnetic layer geometries. Using micromagnetic simulations, we then investigate the minimum requirements for reaching magnetic saturation in these nanomagnets. In terms of either longitudinal or transverse field gradient, the results provide an optimal solution for uniform, saturated nanomagnets, where the magnetic material can be selected according to the strength of the external fields that can be used.
arXiv comment10 pages, 4 figures, supplemental material. All comments most welcome
References in corpus (33)
- The design and verification of Mumax3
- A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
- Electrically driven single electron spin resonance in a slanting Zeeman field
- Electrical control of a long-lived spin qubit in a Si/SiGe quantum dot
- A Coherent Spin-Photon Interface in Silicon
- Strong spin-photon coupling in silicon
- Coherent single electron spin control in a slanting Zeeman field
- A fault-tolerant addressable spin qubit in a natural silicon quantum dot
- Long-Range Microwave Mediated Interactions Between Electron Spins
- Coherent coupling of a single spin to microwave cavity photons
- Superconductor-semiconductor hybrid cavity quantum electrodynamics
- Hyperfine-mediated gate-driven electron spin resonance
- Strong coupling of a spin qubit to a superconducting stripline cavity
- Domain wall pinning and potential landscapes created by constrictions and protrusions in ferromagnetic nanowires
- Coherent spin-spin coupling mediated by virtual microwave photons
- Fast Electrical Control of Single Electron Spins in Quantum Dots with Vanishing Influence from Nuclear Spins
- Robust micro-magnet design for fast electrical manipulations of single spins in quantum dots
- A spin quantum bit with ferromagnetic contacts for circuit QED
- Optimized cavity-mediated dispersive two-qubit gates between spin qubits
- Micro-magnets for coherent control of spin-charge qubit in lateral quantum dots
- Coupling a single electron spin to a microwave resonator: Controlling transverse and longitudinal couplings
- Tunable magnetic textures in spin valves: From spintronics to Majorana bound states
- Coherent Manipulation of Individual Electron Spin in a Double Quantum Dot Integrated with a Micro-Magnet
- Highly coherent spin states in carbon nanotubes coupled to cavity photons
- Electrical control of Majorana Bound States Using Magnetic Stripes
- Electric-dipole-induced spin resonance in a lateral double quantum dot incorporating two single domain nanomagnets
- Low dephasing and robust micromagnet designs for silicon spin qubits
- A fast finite-difference algorithm for topology optimization of permanent magnets
- Optimized micromagnet geometries for Majorana zero modes in low g-factor materials
- Integrating micromagnets and hybrid nanowires for topological quantum computing
- Majorana bound states in nanowire-superconductor hybrid systems in periodic magnetic fields
- Modular nanomagnet design for spin qubits confined in a linear chain
- Magnetometry of micro-magnets with electrostatically defined Hall bars