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Magnetic Monopole Noise

  • Book
  • © 2021

Overview

Authors:
  1. Ritika Dusad

    1. Nucleus Software, New Delhi, India

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  • Nominated as an outstanding PhD thesis by Cornell University
  • Includes an accessible introduction to spin ices and magnetic monopoles
  • Reports development of a SQUID-based flux-noise spectrometer and its subsequent detection of magnetization noise

Part of the book series: Springer Theses (Springer Theses)

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Table of contents (8 chapters)

  1. Front Matter

    Pages i-xvi
    Download chapter PDF

  2. Introduction

    • Ritika Dusad
    Pages 1-9

  3. Magnetic Monopoles in Spin Ices

    • Ritika Dusad
    Pages 11-19

  4. Experiment

    • Ritika Dusad
    Pages 21-34

  5. Plasma of Magnetic Monopoles

    • Ritika Dusad
    Pages 35-42

  6. Analysis

    • Ritika Dusad
    Pages 43-51

  7. Correlations in Magnetic Monopole Motion

    • Ritika Dusad
    Pages 53-56

  8. Fluctuation Dissipation Theorem

    • Ritika Dusad
    Pages 57-59

  9. Conclusions

    • Ritika Dusad
    Pages 61-64

  10. Back Matter

    Pages 65-76
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Keywords

About this book

This thesis presents the first ever measurement of the noise emitted by magnetic monopoles and the development of an exquisitely sensitive magnetic-field-noise spectrometer based on a superconducting quantum interference device (SQUID) that enabled it. Magnetic monopoles are highly elusive elementary particles exhibiting quantized magnetic charge. The prospects for studying them brightened recently with the theoretical discovery that the thermally excited states in certain classes of magnetic insulators exhibit all the characteristics of magnetic monopoles. Furthermore, in 2018, it was predicted that the random motion of magnetic monopoles inside would generate a very specific kind of magnetization noise. In this thesis, the author describes a new experimental technique, so-called spin noise spectroscopy, and the subsequent discovery of virtually all of the predicted features of the magnetic noise expected from a dense fluid of magnetic monopoles in crystals of Dy2Ti2O7. Remarkably, because this magnetic monopole noise occurs in the frequency range below 20kHz, when amplified by the SQUID it is actually audible to humans.

Authors and Affiliations

  • Nucleus Software, New Delhi, India

    Ritika Dusad

About the author

Ritika Dusad received her PhD from Cornell University under the supervision of Prof. Séamus Davis. In her dissertation work, she designed and built a novel spin noise spectrometer that has led to the discovery of 'Magnetic Monopole Noise' in Dysprosium Titanate. The results of that study are presented in this thesis. Remarkably, the motion of magnetic monopoles and frustration of the magnets she studied can actually be heard at temperatures between 1K and 4K.

Ritika Dusad was born and raised in Delhi, India and studied physics at University of California, Los Angeles as an undergraduate student. She is an expert in conceptualizing, designing and building experiments for low temperature physics.

In her spare time she likes to sing Hindustani Classical Music, paint, and read fiction written by Indian authors.

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