Diamond NV Center Probe for Nanoscale Magnetic Characterization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current metrology methods lack the necessary spatial resolution to characterize critical nanoscale features of magnetic recording heads, such as write poles and optical near-field transducers, in magnetic data storage systems.
Innovation Solution
A diamond probe with a tip incorporating one or more Nitrogen Vacancy (NV) centers is attached to an Atomic Force Microscope, utilizing the NV centers for optically detected Electron Spin Resonance (ODMR) and temperature measurements, enabling high-resolution characterization of magnetic recording heads through photoluminescence detection and Stimulated Emission Depletion techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical and magneto-optical metrology methods are used, then the measurement process is simple, but the spatial resolution is insufficient to characterize nanoscale features
Solution Approach 1:
The patent combines multiple measurement capabilities into a single integrated probe: NV centers for magnetic field sensing, photoluminescence for optical near-field characterization, and temperature sensing all within one probe tip. This merging allows simultaneous multi-parameter measurement at the nanoscale without requiring separate complex metrology systems for each measurement type.
Solution Approach 2:
The probe tip is designed with universal functionality to perform multiple characterization tasks: measuring magnetic fields via NV center ODMR, characterizing optical near-field transducers through photoluminescence quenching, and sensing temperature. This multi-functional probe eliminates the need for multiple specialized measurement tools, reducing overall system complexity while maintaining high spatial resolution.
2Measurement precision
If Magnetic Force Microscopy is used, then high spatial resolution is achieved, but quantitative information about magnetic field strength is not provided
Solution Approach 1:
The patent replaces the mechanical force-based detection of Magnetic Force Microscopy with an optical detection method using NV centers. The NV centers' spin state, which is sensitive to magnetic fields, is read out optically through photoluminescence intensity changes. This substitution provides both high spatial resolution and quantitative magnetic field strength information, as the photoluminescence signal directly correlates with the local magnetic field magnitude.
3Measurement precision
If conventional metrology systems are used, then device complexity is low, but characterization of optical near-field transducers and magnetic recording heads is inadequate
Solution Approach 1:
The patent employs NV centers located specifically at the tip of the probe, concentrating the sensing capability exactly where it is needed for nanoscale characterization. The photoluminescence measurement is also localized to the immediate vicinity of the probe tip, enabling precise local measurement of optical near-field transducer performance and magnetic field characteristics without requiring complex system-wide modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides nanometer-scale spatial resolution and quantitative information about magnetic field strength and temperature, effectively characterizing the magnetic recording heads and near-field transducers, enhancing the precision of magnetic data storage systems.
Implementation Method 1
The probe with integrated components enable excitation of photoluminescence in the NV center
Implementation Method 2
measuring Optically Detected Spin Resonance (ODMR) by detecting a decrease in a spin dependent photoluminescence in response to the excitation illumination caused by electron spin resonance (ESR) of the at least one nitrogen vacancy center
Implementation Method 3
The probe with integrated components enable excitation of photoluminescence in the NV center as well as optically detected Electron Spin Resonance (ODMR) and temperature measurements, and may further serve as a light probe utilizing the physical effect of Stimulated Emission Depletion (STED)
Data Source
AI summary
A diamond probe is suitable to be attached to an Atomic Force Microscope and is created with a tip that incorporates a one or more Nitrogen Vacancy (NV) centers located near the end of the tip. The probe arm acts as an optical waveguide to propagate the emission from the NV center with high efficiency and a beveled end directs excitation light to the NV center and directs photoluminescence light emanating from the NV center into the probe arm. The light source (or a portion of the light source), a detector, as well as an RF antenna, if used, may be mounted to the probe arm. The probe with integrated components enable excitation of photoluminescence in the NV center as well as optically detected Electron Spin Resonance (ODMR) and temperature measurements, and may further serve as a light probe utilizing the physical effect of Stimulated Emission Depletion (STED).