AC Susceptometry for Characterizing Magnetic Spin Structures

Undergraduate Honors Thesis

Citations

Citeable URL: https://scholar.colorado.edu/concern/undergraduate_honors_theses/mp48sd33h

Abstract

Magnetic phase transitions between non-trivial ordered states are investigated through AC Susceptibility measurements. An AC Susceptometer was built for the purpose of detecting variations in a material’s magnetic structure in response to adjustments of external conditions. The AC Susceptometer is sensitive to subtle changes in magnetic ordering, indicated by distinct features in measured AC Susceptibility data when a phase transition occurs. The coil design and characterization is discussed in detail. The dependence of AC Susceptibility on temperature and applied DC field conditions are explored in samples of Cr_1/3NbS_₂, 10% Iron-doped MnSi (Mn_0.9Fe_0.1Si), and CeRu₂Ga₂B (CRGB). Distinct and well-defined phase boundaries are reported, highlighting the advantages of this AC Susceptometry technique.

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