Magnetic susceptibility and magnetization fluctuation measurements of mixed Gadolinium-Yttrium Iron Garnets

Abstract

We study the magnetic properties of Gadolinium-Yttrium Iron Garnet (${\text{Gd}}_x{\text{Y}}_{3-x}{\text{Fe}}_5{\text{0}}_{12}$, $x=3,1.8$) ferrite ceramics. The complex initial permeability is measured in the temperature range 2 K to 295 K at frequency of 1 kHz, and in the frequency range 100 Hz to 200 MHz at temperatures 4 K, 77 K, and 295 K. The magnetic viscosity-induced imaginary part of the permeability is observed at low frequencies. Measurements of the magnetization noise are made at 4 K. Using the fluctuation-dissipation theorem, we find that the observed magnetization fluctuations are consistent with our measurements of the low-frequency imaginary part of permeability. We discuss some implications for proposed precision measurements as well as other possible applications.

References in corpus (10)

• Violation of the fluctuation-dissipation theorem in glassy systems: basic notions and the numerical evidence
• A low-noise ferrite magnetic shield
• Solid State Systems for Electron Electric Dipole Moment and other Fundamental Measurements
• Measurement of the electron electric dipole moment using GdIG
• On the sensitivity of condensed-matter P- and T-violation experiments
• Energy levels and lifetimes of Gd IV and enhancement of the electron dipole moment
• Enhancement of the electron electric dipole moment in gadolinium garnets
• Searches for violation of fundamental time reversal and space reflection symmetries in solid state experiments
• Manifestations of nuclear anapole moments in solid state NMR
• A possibility for precise Weinberg angle measurement in centrosymmetric crystals with axis

Cited by in corpus (9)

• Simultaneous Broadband Vector Magnetometry Using Solid-State Spins
• Search for axion-like dark matter with ferromagnets
• A Precessing Ferromagnetic Needle Magnetometer
• The prospects for an electron electric dipole moment search with ferroelectric (Eu,Ba)TiO${}_3$ ceramics
• Ultrafast spontaneous spin switching in an antiferromagnet
• The prospects for a new search for the electron electric dipole moment in solid Gadolinium iron garnet ceramics
• Search for exotic short-range interactions using paramagnetic insulators
• Scalar dark matter induced oscillation of permanent-magnet field
• Subharmonic lock-in detection and its optimisation for femtosecond noise correlation spectroscopy