Abstract
We have previously investigated magnetic properties of
platinum thin films [1]. In order to continue measurements on the
magnetic properties of platinum, we needed an instrument to measure
the magnetization of thin films. This paper discusses our design
and construction of a vibrating sample magnetometer (VSM). This
device measures the magnetic moment of a sample by vibrating the
sample between pick-up coils. The induced EMF in the coils is
proportional to the magnetic moment of the sample. We control the
frequency and amplitude of vibrations by using a modified speaker
as a vibrator connected to a source of oscillating voltage. At
first, we induced magnetization in our samples by using
electromagnets to generate an external field, and the VSM we built
was able to measure magnetization of large samples. The current
that powers the electromagnets produced too much magnetic noise, so
we are redesigning the VSM using permanent magnets instead. This
design achieves much lower noise. Future work will include
finishing the final design of the magnetometer and making
measurements of the magnetization of thin film
ferromagnets.
Table of Contents
Contents
I Introduction 1
1 Magnetization 1
2 Methods of Measuring Magnetization 3
3 The Vibrating Sample Magnetometer 4
4 My Project 5
4.1 Background and Motivation 5
4.2 Designing a VSM 7
II Methodology and Results 12
5 Powering the Speaker 12
6 Mechanical Assembly 14
7 Pick-up Coils 16
8 Testing the Magnetometer 18
9 New Design 23
III Conclusion and Future Work 25
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