Magnetoresistance & Giant Magnetoresistance Effect for Advanced Physics Lab

The Magnetoresistance & Giant Magnetoresistance Effect for Advanced Physics Lab is designed to investigate the change in electrical resistance of materials under the influence of magnetic fields. The system enables the study of several important magnetoresistance phenomena, including anisotropic magnetoresistance (AMR) and giant magnetoresistance (GMR), which play key roles in modern electronics, magnetic sensing, data storage, and spintronic technologies. The apparatus includes three different magnetoresistance sensors: a multilayer GMR sensor, a spin-valve GMR sensor, and an anisotropic magnetoresistance sensor. These sensors allow students to compare different magnetoresistive behaviors and understand their practical applications. Designed for advanced laboratory instruction, the system provides hands-on experience in magnetic measurements, sensor calibration, hysteresis analysis, and current sensing techniques, making it an excellent teaching tool for colleges and universities. Physics Lab Experiments from Atico Exports.

Experimental Applications:

Study Magnetoresistance Effects:

• Measure magnetic resistance characteristics of different magnetoresistance sensors
• Compare sensor responses to external magnetic fields
• Investigate magnetoresistance behavior under varying field strengths

Analyze Relative Resistance Change:

• Plot relative resistance change versus magnetic field strength
• Determine maximum resistance variation

Calibrate Magnetoresistance Sensors:

• Learn sensor calibration techniques
• Determine sensor sensitivity for magnetic field measurement applications

Measure Sensor Output Characteristics:

• Investigate the relationship between sensor output voltage and input current
• Calibrate a magnetoresistance-based current sensor

Plot Magnetic Hysteresis Loops:

• Use the spin-valve GMR sensor to obtain hysteresis curves
• Analyze magnetic switching behavior
• Evaluate sensor performance characteristics

Multilayer GMR Sensor

Linear Range:

• 0.15 – 1.05 mT

Sensitivity:

• 30.0 – 42.0 mV/V/mT

Magnetoresistance:

• 5.0 kΩ ± 1.0 kΩ

Precision Resistor:

• 1.20 kΩ

Spin-Valve GMR Sensor

Linear Range:

• -0.81 – 0.87 mT

Sensitivity:

• 13.0 – 16.0 mV/V/mT

Magnetoresistance:

• 1.3 kΩ ± 0.26 kΩ

Precision Resistor:

• 360 kΩ

Anisotropic Magnetoresistance Sensor

Linear Range:

• -0.6 – 0.6 mT

Sensitivity:

• 8.0 – 12.0 mV/V/mT

Magnetoresistance:

• 1.0 kΩ ± 0.2 kΩ

Precision Resistor:

• 270 kΩ

System Specifications

Sensor Power Supply:

• 5 V DC

Helmholtz Coil:

• 200 Turns per Coil
• Radius: 100 mm

Helmholtz Coil Constant Current Source:

• 0 – 1.2 A Adjustable

Measurement Constant Current Source:

• 0 – 5 A Adjustable

Parts List:

Main Unit with Measurement System:

• Quantity: 1

Multilayer GMR Sensor:

• Quantity: 1

Spin-Valve GMR Sensor:

• Quantity: 1

Anisotropic Magnetoresistance Sensor:

• Quantity: 1

Helmholtz Coil Assembly:

• Quantity: 1 Set

Power Cord:

• Quantity: 1

Instruction Manual:

• Quantity: 1

• Compact Design
• Comprehensive Experimental Applications
• Ideal for Solid-State Physics Teaching
• Multiple Magnetoresistance Sensor Types Included
• Suitable for Material Physics and Sensor Technology Studies