Antiferromagnetic Spin Waves

Coherent terahertz control of antiferromagnetic spin waves

Ultrafast charge and spin excitations in the elusive terahertz regime1,2 of the electromagnetic spectrum playa pivotal role in condensed matter3-13• The electric field of free-space terahertz pulses has provided a direct gateway to manipulating the motion of charges on the femtosecond timescale6-9 • Here, we complement this process by showing that the magnetic component of intense terahertz tra...

Spin waves in antiferromagnetic spin chains with long-range interactions

We study antiferromagnetic spin chains with unfrustrated long-range interactions that decay as power laws with exponent b , using the spin-wave approximation. We find for sufficiently large spin S that the Neel order is stable at T50 for b,3, and survives up to a finite Neel temperature for b,2, validating the spin-wave approach in these regimes. We estimate the critical values of S and T for t...

Spin Waves in Layered Structures of Antiferromagnetic F.C.C. MnTe

Standing Spin Waves in an Antiferromagnetic Molecular Cr6 Horseshoe

The antiferromagnetic molecular finite chain Cr6 was studied by inelastic neutron scattering. The observed magnetic excitations at 2.6 and 4.3 meV correspond, due to the open boundaries of a finite chain, to standing spin waves. The determined energy spectrum revealed an essentially classical spin structure. Hence, various spin-wave theories were investigated in order to assess their potential ...

Excitation of spin waves by tunneling electrons in ferromagnetic and antiferromagnetic spin-2 Heisenberg chains

J. P. Gauyacq1,2 and N. Lorente3 1CNRS, Institut des Sciences Moléculaires d’Orsay, ISMO, UMR 8214, Bâtiment 351, 91405 Orsay Cedex, France 2Université Paris-Sud, Institut des Sciences Moléculaires d’Orsay, ISMO, UMR 8214, Bâtiment 351, 91405 Orsay Cedex, France 3Centre d’Investigació en Nanociéncia i Nanotecnologia (CSIC-ICN), Campus de la UAB, E-08193 Bellaterra, Spain (Received 14 October 20...