Tootfinder

Balmer Absorption in Iron Low-Ionization Broad Absorption Line Quasars
Karen M. Leighly, Sarah C. Gallagher, Hyunseop Choi, Donald M. Terndrup, Julianna R. Voelker, Gordon T. Richards, Leah K. Morabito
https://arxiv.org/abs/2509.07611

Balmer Absorption in Iron Low-Ionization Broad Absorption Line Quasars
While C IV is the most common absorption line in Broad Absorption Line Quasar spectra, Balmer absorption lines are among the rarest. We present analysis of Balmer absorption in a sample of fourteen iron low-ionization BAL quasars (FeLoBALQs); eight are new identifications. We measured velocity offset, width, and apparent optical depth. The partial covering ubiquitous in BAL quasar spectra alters the measured Balmer optical depth ratios; taking that into account, we estimated the true H(n= 2) co…

Tuning and Suppression of YIG Magnetisation Dynamics via Antiferromagnetic Interface Coupling
Oscar Cespedes, Hari B. Vasili, Matthew Rogers, Paul S. Keatley, Manan Ali, Bryan Hickey, Robert J. Hicken
https://arxiv.org/abs/2509.13870

Tuning and Suppression of YIG Magnetisation Dynamics via Antiferromagnetic Interface Coupling
The magnetisation dynamics of yttrium iron garnet (Y3Fe5O12, YIG) are key to the operation of spintronic and microwave devices. Here, we report a pathway to manipulate the frequency, damping and absorption of YIG thin films via interface coupling. The growth on YIG of PtMn, a metallic antiferromagnet, leads to a power dependence of the oscillation frequency and an increased linewidth at low fields. In gadolinium iron garnet/YIG film bilayers, the two films couple antiferromagnetically at low te…