Observation of Spin Locking in Dysprosium through a Nonlinear AC Magnetic Response

Abstract

Previous research has used neutron diffraction, thermal expansion, and ultrasound attenuation to investigate commensurate turn angle effects (''spin locking'') in the helical magnetic region of dysprosium (Dy). We have succeeded in observing many of those spin locking states, allowing for the coexistence of incommensurate and commensurate states, through an AC magnetic response, mainly the first-(M 1! ) and third-(M 3! ) harmonic responses. This is physically equal to detecting the Rayleigh loop, thus reflecting the irreversible displacement of the domain wall. The characteristic M 3! signals at the 10 À8 emu level have been detected using the median of twenty or fifty data points for the detection accuracy to reach the 10 À9 emu level.

Magnetic diagnostics using the third-harmonic magnetic response for a molecule-based magnet networked by a single chiral ligand

“…These responses accompany M 3x /M 1x that exceeds 10%, which is much higher than the usual level observed in magnetically glassy systems 15,26,27 and in a helical magnet. 28 Figure 7 shows how this situation allows prominent magnetic hysteresis in the case of h ¼ 0.1 and 2.0 Oe at f ¼ 1 Hz: We provide the magnetic hysteresis obtained at several temperatures including characteristic temperatures for #1-#4: 9.0 K (#1), 35.0 K (#2), 36.0 K (#3), and 37.1 K (#4). Here, the magnetic hysteresis was reproduced by summing three components such as M 0 1x , M 00 1x , and M 0 3x and thereafter plotting the sum against the magnetic field (H).…”

“…27 Thus, the presence of M 3x also reveals whether or not magnetic hysteresis appears prominently in a given situation. In a few typical ferromagnets such as Gd, 24,26 Tb, 26 Dy, 28 and Ni, 25 low-field magnetic hysteresis below the magnetic ordering temperature (T C ) has been well explained via the M 1x þ M 3x response in the sense of the Rayleigh law. Recently, in Dy, many anomalies in M 3x were connected with the spin-locking phenomenon, reflecting a slight change in the magnetic hysteresis as a function of T. 28 Thus, we can acquire important knowledge on magnetic domain formation at the low field limit that cannot be obtained via the magnetic hysteresis in the large dc magnetic field.…”

Effects of Pressure on Two-Dimensional Networked Single-Molecule Magnets Exhibiting AC-Field-Switchable Magnetic Properties

“…can be an effective tool for detecting magnetic domain formation. 10,11) For instance, Gîrtu et al applied a series of n! 's to study triangular Heisenberg antiferromagnets with the Dzyaloshinskii-Moriya interaction and verified canted antiferromagnetism and glassines via 2!…”