Submicron giant magnetoresistive sensors for biological applications
نویسندگان
چکیده
We have fabricated submicron giant magnetoresistive (GMR) structures and evaluated their sensitivity for biomagnetic applications. GMR devices were fabricated using electron beam lithography, with minimum dimensions below 100 nm. We developed a new characterization technique for these sensors, using a scanned nanoscale magnetic probe and monitoring the resulting response of the sensors. The magnetic field from the scanned probe is similar to that generated by the magnetic particles used to tag bioanalytes. The devices demonstrated extremely high magnetic field resolution. Noise measurements, combined with a local field sensitivity from the scanned probe measurements, predict a s c A f ©
منابع مشابه
Recent Developments of Magnetoresistive Sensors for Industrial Applications
The research and development in the field of magnetoresistive sensors has played an important role in the last few decades. Here, the authors give an introduction to the fundamentals of the anisotropic magnetoresistive (AMR) and the giant magnetoresistive (GMR) effect as well as an overview of various types of sensors in industrial applications. In addition, the authors present their recent wor...
متن کاملUltrasensitive Magnetic Nanoparticle Detector for Biosensor Applications
Ta/Ru/Co/Ru/Co/Cu/Co/Ni80Fe20/Ta spin-valve giant magnetoresistive (GMR) multilayers were deposited using UHV magnetron sputtering and optimized to achieve a 13% GMR ratio before patterning. The GMR multilayer was patterned into 12 sensor arrays using a combination of e-beam and optical lithographies. Arrays were constructed with 400 nm × 400 nm and 400 nm × 200 nm sensors for the detection of ...
متن کاملDeep Flaw Detection with Giant Magnetoresistive (gmr) Based Self-nulling Probe
The use of giant magnetoresistive (GMR) sensors for electromagnetic nondestructive evaluation has grown considerably in the last few years [1-4]. Technological advances in the research and development of giant magnetoresistive materials has led to commercially available GMR sensors with many qualities well suited for electromagnetic NDE. Low cost GMR magnetometers are now available which are hi...
متن کاملA Magnetoresistive Tactile Sensor for Harsh Environment Applications
A magnetoresistive tactile sensor is reported, which is capable of working in high temperatures up to 140 °C. Hair-like bioinspired structures, known as cilia, made out of permanent magnetic nanocomposite material on top of spin-valve giant magnetoresistive (GMR) sensors are used for tactile sensing at high temperatures. The magnetic nanocomposite, consisting of iron nanowires incorporated into...
متن کاملModel for detection of immobilized superparamagnetic nanosphere assay labels using giant magnetoresistive sensors
Commercially available superparamagnetic nanospheres are commonly used in a wide range of biological applications, particularly in magnetically assisted separations. A new and potentially significant technology involves the use of these particles as labels in magnetoresistive assay applications. In these assays, magnetic bead labels are used like fluorescent labels except that the beads are exc...
متن کامل