AMR vs. GMR Vs. TMR magnetic sensors

Many companies are working hard in the design, development and fabrication of Anisotropic Magneto-Resistance (AMR), Giant Magneto-Resistance (GMR), and Magnetic Tunneling Junction (MTJ) magnetic thin film sensors.

AMR vs. GMR Vs. TMR magnetic sensors

AMR vs. GMR Vs. TMR magnetic sensors

Working with a variety of magnetic materials (see table below) AMS deposition techniques achieve optimal conditions (uniformity, composition control, easy/hard axis orientation). The thickness range of these materials spans from <10Å (1nm) for GMR and MTJ applications to >10µ for magnetic shields and flux-concentrators.

Materials Magnetic Properties Application Deposition Technique Typical Layer Thk.
NiFe (Permalloy) Soft AMR, GMR sensors Sputtered 10Ǻ – 1000Ǻ
NiFe (Permalloy) Soft Shields, Poles Plated 1µm – 10µm
NiFe (45/55) Soft, higher moment Shields, Poles Plated 1µm-10µm
CoPt Hard, high coercivity Permanent magnets Sputtered 500 Ǻ – 10 µm
Co ternary alloy Soft, higher moment Shields, Inductors, Poles Sputtered 1 µm – 10 µm
IrMn, PtMn Anti-ferromagnetic GMR, MTJ sensors Sputtered 50 – 250 Ǻ

 

typical AMR transfer curve

typical AMR transfer curve

We use several different vacuum deposition tools to deposit a variety of magnetic materials, including the GMR / MTJ cluster disposition system seen below. The metrology equipment for the characterization of magnetic materials includes BH loopers, VSM (Vibrating Sample Magnetometer), MFM (Magnetic Force Microscopy) and RMM (Remanent Moment Magnetization).

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor

D6x2.5mm N35H Axial Disc Magnets for Linear Position Sensor,  Sintered NdFeB Disc Magnets, Rare Earth Neodymium Sensor Magnet, Linear Position Sensor Magnets Axial Disc Magnets Part No.: HSND-0062.5-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D6 x 2.5 mm Magnetisation Direction: Axial Residual Magnetic […]

 

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor

D4x2.5mm Axial N35H Disc Magnet for Linear Position Sensor, NdFeB Sintered Disc Magnet, Sensor Rare Earth Neodymium Magnet N35H Disc Magnet Part No.: HSND-0042.5-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D4 x 2.5 mm Magnetisation Direction: Axial Residual Magnetic Flux Density (Br): […]

 

D2x0.8mm N35H Axial Disc Magnet for Position Sensor

D2x0.8mm N35H Axial Disc Magnet for Position Sensor

D2x0.8mm N35H Axial Disc Magnet for Position Sensor, Rotary Position Sensor Magnet, N35H Neodymium Disc Magnet Axial Axial Disc Magnet Part No.: HSND-02008-35H Magnetisation Grade: N35H Material: Sintered Neodymium-Iron-Boron (Rare Earth NdFeB) Plating / Coating: Nickel (Ni-Cu-Ni) Magnet Shape: Disc, Disk, Round Magnet Size: D2 x 0.8mm Magnetisation Direction: Axial Residual Magnetic Flux Density (Br): 1170-1220 mT (11.7-12.2 […]