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UID:UW-Physics-Event-8531
DTSTART:20231220T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260414T013402Z
LAST-MODIFIED:20231204T141517Z
LOCATION:5310 CH
SUMMARY:The Hall effect in Nonmagnetic\, Ferromagnetic\, and Antiferro
 magnetic Thin films\, Thesis Defense\, Neil Campbell\, Physics PhD Gra
 duate Student
DESCRIPTION:While the Hall effect has been around for well over a cent
 ury now\, its utility as a probe of conducting\, and especially magnet
 ic\, materials is as high as ever. As thin-film synthesis techniques c
 ontinue expanding the boundaries of what materials are possible to cre
 ate the Hall effect allows experimental probing of new and old phenome
 na in these films. Currently\, Hall effects resulting from topological
  properties of materials are of high interest\, be they from a topolog
 ically-protected band structure or a Berry phase that results from an 
 antiferromagnetic spin arrangement. It was the goal of my research man
 y times to observe such an effect\, and in this regard the subsequent 
 chapters could be viewed as a litany of failure. However\, the investi
 gations pursued did result in better understanding of the materials an
 d in some cases\, like in Pr2Ir2O7 finding new interesting phenomena. 
 In this case I report that a broken symmetry as a result of growing th
 e material in thin-film form results in a spin Hall effect that persis
 ts to much higher temperatures. Such a result suggests a road map for 
 increasing the temperatures at which some low-temperature phenoma are 
 observed. In SrIrO3 after pursuing a topolgical band structure\, I end
 ed up showing the lack of magnetic ordering in distorted Perovskite Sr
 IrO3\, which many researchers had presumed to exist. In the Mn3GaN cha
 pters I use other magnetic characterizations and analysis to show the 
 impact of heterostructring on magnetic anisotropy in a way that demons
 trates a path for manipulating hard ferrimagnets to be amenable for sp
 intronics. And finally use the well-known phenomenon of exchange bias 
 to show how to break the degeneracy of antiferromagnetic domains\, a p
 roblem that currently plagues many promising spintronic candidate mate
 rials.
URL:https://www.physics.wisc.edu/events/?id=8531
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