title: Ultrafast spin dynamics and switching via spin transfer torque in antiferromagnets with weak ferromagnetism.
abstract: The spin-torque driven dynamics of antiferromagnets with Dzyaloshinskii-Moriya interaction (DMI) were investigated based on the Landau-Lifshitz-Gilbert-Slonczewski equation with antiferromagnetic and ferromagnetic order parameters (l and m, respectively). We demonstrate that antiferromagnets including DMI can be described by a 2-dimensional pendulum model of l. Because m is coupled with l, together with DMI and exchange energy, close examination of m provides fundamental understanding of its dynamics in linear and nonlinear regimes. Furthermore, we discuss magnetization reversal as a function of DMI and anisotropy energy induced by a spin current pulse.
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.|Grünberg Center for Magnetic Nanomaterials, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
authors.forename: Tae Heon
authors.initials: TH
authors.lastname: Kim
authors.affiliation: Grünberg Center for Magnetic Nanomaterials, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
authors.forename: Peter
authors.initials: P
authors.lastname: Grünberg
authors.affiliation: Division of Navigation Science, Mokpo National University, Mokpo 58628, Republic of Korea.
authors.forename: Song Hee
authors.initials: SH
authors.lastname: Han
authors.affiliation: School of Materials Science and Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.|Grünberg Center for Magnetic Nanomaterials, Gwangju Institute of Science and Technology (GIST), Gwangju 61005, Republic of Korea.
authors.forename: Beongki
authors.initials: B
authors.lastname: Cho