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Instruments / Technical Area	Publication Details	Published	Actions
I16-Materials and Magnetism	Strain-induced antiferromagnetic domain switching via the spin Jahn-Teller effect Dylan Behr , Leonid S. Taran , Daniel G. Porter , Alessandro Bombardi , Dharmalingam Prabhakaran , Sergey V. Streltsov , Roger D. Johnson Physical Review B 110 DOI: 10.1103/PhysRevB.110.L060408 Diamond Proposal Number(s): [32034] Open Access Show Abstract ▼ Abstract: The spin Jahn-Teller effect, where a degeneracy of magnetic ground states is spontaneously lifted by structural distortions, lends itself to exploitation by the implied magnetoelastic coupling. CoTi2⁢O5 hosts a frustrated topology of magnetic interactions that could realize such coupling, since the observed magnetic ground state requires a spontaneous monoclinic distortion of the crystal. Using resonant elastic x-ray scattering to simultaneously probe the magnetic structure and lattice distortion of CoTi2⁢O5, we demonstrate near complete magnetic domain switching by an applied uniaxial stress that is conjugate to the monoclinic strain. Our results, supported by density functional theory calculations, confirm that CoTi2⁢O5 displays spin Jahn-Teller effects that can be understood in terms of modulated Heisenberg exchange interactions, and demonstrate the potential functionality of spin Jahn-Teller materials in spintronic devices sensitive to uniaxial strain.	Aug 2024
	Electric field control of the magnetic chiralities in ferroaxial multiferroic RbFe(MoO4)2 Alexander J. Hearmon , Federica Fabrizi , Laurent C. Chapon , Roger D. Johnson , Dharmalingam Prabhakaran , Sergey V. Streltsov , Penelope J. Brown , Paolo G. Radaelli Physical Review Letters 108 (23) DOI: 10.1103/PhysRevLett.108.237201 PMID: 23003983 Show Abstract ▼ Abstract: The coupling of magnetic chiralities to the ferroelectric polarization in multiferroic RbFe(MoO4)2 is investigated by neutron spherical polarimetry. Because of the axiality of the crystal structure below Tc=190K, helicity and triangular chirality are symmetric-exchange coupled, explaining the onset of the ferroelectricity in this proper-screw magnetic structure—a mechanism that can be generalized to other systems with ferroaxial distortions in the crystal structure. With an applied electric field, we demonstrate control of the chiralities in both structural domains simultaneously	Jun 2012

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