Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session S37: Spin Glasses, Spinels and Other Frustrated Systems
11:15 AM–1:51 PM,
Thursday, March 7, 2019
BCEC Room: 206A
Sponsoring Units: GMAG DCMP DMP
Chair: Adam Aczel, Oak Ridge National Laboratory
Abstract: S37.00003 : Heisenberg domain state in thin-film ferromagnet/antiferromagnet bilayers is a magnetic glass*
11:39 AM–11:51 AM
We utilize magnetoelectronic and magneto-optical measurements of relaxation and dynamical characteristics in F/AF bilayers with AF=CoO, NiO, and FeMn to show that HDS is a magnetic glass. Our observations include nearly temperature-independent universal magnetic aging below a certain temperature TG, transitioning to a strong temperature dependence at T>TG. The transition is associated with a qualitative change in the dependence on the magnetic history. Transverse ac susceptibility measurements indicate that the magnetic viscosity varies by 4 orders of magnitude when T~TG is varied by 20 K, indicative of magnetic freezing consistent with the glass transition. Our results demonstrate that thin-film F/AF bilayers are a readily realizable and experimentally accessible quasi-2d magnetic glass system with controllable characteristics.
 A. Malozemoff, Phys. Rev. B 37, 7673 (1988).
*Supported by NSF DMR-1504449
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