Reentrant spin-flop transition in nanomagnets

Dimensionality driven spin-flop transition in layered iridates.

Using resonant x-ray diffraction, we observe an easy c-axis collinear antiferromagnetic structure for the bilayer Sr3Ir2O7, a significant contrast to the single layer Sr2IrO4 with in-plane canted moments. Based on a microscopic model Hamiltonian, we show that the observed spin-flop transition as a function of number of IrO2 layers is due to strong competition among intra- and interlayer bond-di...

Angular dependence of the spin-flop transition and a possible structure of the spin-flop phase of Gd5Ge4

The angular dependence of the spin-flop transition in Gd5Ge4 has been examined by magnetization measurements of a single crystal. When the magnetic field vector is tilted away from the antiferromagnetic easy axis (c axis) toward the b axis, the spin-flop transition always remains first order in nature. However, when the field vector is tilted away from the c axis toward the a axis, the first or...

Intermediate spin, Schrödinger cat states, and nanomagnets.

Quantum tunneling in nanomagnets finds a natural description in terms of intermediate spin. Periodic magnetic effects correspond to a change of flux by the flux quantum Phi(0). Schrödinger cat states with different superpositions of the applied magnetic field occur. The molecular magnet Fe(8) is discussed and new effects are predicted for Mn(12).

Spin-Flop Transition and Magnetocaloric Effect through Disconnected Magnetic Blocks in CoIII/CoIV Oxybromides

Ultrafast Magnetism of a Ferrimagnet across the Spin-Flop Transition in High Magnetic Fields.

We show that applying magnetic fields up to 30 T has a dramatic effect on the ultrafast spin dynamics in ferrimagnetic GdFeCo. Upon increasing the field beyond a critical value, the dynamics induced by a femtosecond laser excitation strongly increases in amplitude and slows down significantly. Such a change in spin response is explained by different dynamics of the Gd and FeCo magnetic sublatti...