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Anisotropic Magnetoresistance
Posted 30 mai 2013, 08:43 UTC−4 Low-Frequency Electromagnetics, Materials, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3 1 Reply
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I need to simulate an AMR sensor, which is a magnetometer, whose working principle is based on the Anisotropic Magnetoresistance. The sensor is made of a thin strip of permalloy, a ferromagnetic material, with its typical hysteretic behaviour (M-H curve). The material is anisotropic, which means that its behaviour depends on the direction of the external Magnetic Field H. Due to this Magnetic Field H, the Magnetization Vector M rotates. The resistivity of the sensor depends of the angle between the Current I flowing through the sensor and the Magnetization Vector M.
First problems are:
- How to define the material (it's not included into the Material Library). Is there in the Material Library any similar material with the same properties? How can I insert my M-H curve (with hysteresis) into the model from data?
- How can I define an intrinsic Magnetization Vector M of the material?
- Which is the proper model to describe this sensor? I think it's the Magnetic Fields No Currents one, but I'm not sure.
The main problem is:
- How can I get the rotation of the Magnetization Vector M?
Thank you!
Paolo
Hello Paolo Minotti
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I'm a beginner for COMSOL Multiphysics, and I need to simulate the 2D magnetoresistance of a PN Junction.I'm using the comsol 5.0, but I don't know which physics I should select in the "Add Physics" section in comsol.Fortunately,I found your post in the comsol discussion forum,so I decide to send the message to you,I hope that you can help me to solve the problem. If it's not a problem for you ,please describe in detail these steps of modelling. I will also very much appreciate for your corresponding recommendations in this modelling question.Thank you very much!
Sincerely,Huaa Wen