Chirality-dependent spin-transfer torque and current-induced spin rotation in helimagnets

Structural and Magnetic Properties of FeNi Films and FeNi-Based Trilayers with Out-of-Plane Magnetization Component

“…Nevertheless, the absence of the “transcritical” state and, as a consequence, the absence of rotatable anisotropy opens the possibility of more precise control of the features of the magnetic anisotropy of such film systems. This creates a perspective for the preparation of the films with a helical magnetic anisotropy by the deposition of the films at the rotating magnetic field and possible manipulation of the magnetization of helimagnets through the spin-transfer torque effect [ 39 ].…”

Magnetic Anisotropy of FeNi Multilayer Films with Different Orientations of the Magnetic Anisotropy Axes in Adjacent Layers

“…For FeNi films, assuming K = 2 × 10 3 erg/cm 3 , and the exchange constant A = 5.5 × 10 −7 erg/cm value, one predicts l cr = 1.0 µm [32]. However, this thickness is too large for the implementation of the devices based on the spin-orbit torque effect using chiral helimagnet [27,33]. Creating multilayered structures with sequential changes in the orientation of the magnetic anisotropy axis in adjacent layers seems to be a promising way to reduce the value of the critical thickness l cr .…”

“…With an increase in the thickness of the magnetic layers, the formation of a Bloch-type magnetic domain wall extending across the thickness of the bilayer is possible [23]. Such behavior creates a perspective for the preparation of thin magnetic films with a helical magnetic anisotropy by the deposition of the multilayered structures with different orientations of the easy magnetization axis of each individual layer and possible manipulation of the magnetization of helimagnets through the spin-transfer torque effect [27]. The spin-transfer torque phenomenon is an effect in which the orientation of a magnetic layer in either a magnetic tunnel junction or spin valve appears to be modified using a spin-polarized current.…”

“…An estimate for the frequency of such rotation of the magnetization spiral was also given. It was proposed to use such magneto-chiral structures for the creation of a generator of electromagnetic radiation with tunable frequency [27,28]. In addition, chirality-based all-optical logic gates have recently been experimentally demonstrated.…”

“…However, in this case, the film thickness should be approximately 1 µm. However, it is too large for the implementation in the devices based on the spin-orbit torque effect using chiral helimagnet [27,33].…”