Influence Of In-plane Field Research Articles

Tunable chiral spin texture in magnetic domain-walls.

Magnetic domain-walls (DWs) with a preferred chirality exhibit very efficient current-driven motion. Since structural inversion asymmetry (SIA) is required for their stability, the observation of chiral domain walls in highly symmetric Pt/Co/Pt is intriguing. Here, we tune the layer asymmetry in this system and observe, by current-assisted DW depinning experiments, a small chiral field which sensitively changes. Moreover, we convincingly link the observed efficiency of DW motion to the DW texture, using DW resistance as a direct probe for the internal orientation of the DW under the influence of in-plane fields. The very delicate effect of capping layer thickness on the chiral field allows for its accurate control, which is important in designing novel materials for optimal spin-orbit-torque-driven DW motion.

Influence of in-plane fields on the three kinds of hard domains

The influence of in-plane field on three kinds of hard domains was studied experimentally by means of direct current bias fields reconstruction. The experiment verifies that VBLs in those three kinds of hard domains collapse gradually under the in-plane field. And the conclusion we obtained that these hard domains have the same range of the critical in-plane field ［H1ip,H2ip］ corrects the previous view that (H1ip)IIDH1ip)IDH1ip)OHB. By revealing that the breakdown of VBLs affected by in-plane field is independent of the rigidity of the hard domains, this paper provides an important clue for interpreting the mechanism of the VBLs' vanishing and a new scheme for exactly measuring the critical in-plane field under which VBLs begin to disappear.

Influence of in-plane field on the stability of vertical Bloch lines in the walls of OHB at various bias fields

The stability of vertical Bloch line (VBL) chains subjected to in-plane field ( H ip) was statistically studied for the ordinary hard bubbles (OHB) in garnet bubble films at various bias fields ( H b). The dumbbell domains were also investigated. We found that ( H ip (1)) IID<( H ip (1)) ID<( H ip (1)) OHB and ( H ip (2)) IID=( H ip (2)) ID=( H ip (2)) OHB when keeping H b unchanged. With the increasing of H b, the in-plane field H ip (1), H ip * and H ip (2) all decrease, while the in-plane field range [ H ip (1), H ip * ] and [ H ip (1), H ip (2)] become narrower. Here, H ip (1) is the initial critical in-plane field where VBLs in the walls of three types of hard domains are annihilated, H ip * stands for the in-plane field where the retention rate of three types of hard domains R reduces to zero, and H ip (2) is the lowest in-plane field where VBLs in their corresponding hard domains are annihilated completely.

Influence of in-plane field on vertical Bloch line in the walls of the second kind of dumbbell domains at various temperatures

The stability of vertical Bloch lines (VBLs) in the second kind of dumbbell domain (IIDs) walls in liquid phase epitaxy garnet bubble films subjected to an in-plane field at various temperatures is studied experimentally. It is found that there exists a critical in-plane field range depending on temperature, in which vertical Bloch lines (VBLs) in the second kind of IIDs walls are unstable, i.e., [Hip(1)(T),Hip(2)(T)]. Here, Hip(1)(T) is the initial critical in-plane field at which VBLs in the walls of IIDs annihilate; while Hip(2)(T) is the lowest in-plane field at which all VBLs in the walls of IIDs have annihilated completely. Also, the critical in-plane field range [Hip(1)(T),Hip(2)(T)],Hip(1)(T) and Hip(2)(T) all decrease with the temperature increasing. Hip(1)(T) and Hip(2)(T) reach zero at T0′ and T0, respectively.

Influence of in-plane fields on the soft segments in garnet bubble films

The influence of in-plane field H ip on the soft segments in garnet bubble films was experimentally studied. It was found that H ip affects the stripe-to-bubble transition field of soft domain segments H sb and the collapse field of soft bubbles H 0 . Moreover, H sb and H 0 change along with H ip , and both of them are related to the crystal direction. Comparing the results for different crystal directions, we find a dividing in-plane field (H ip ) d related to the parameters of the samples. (H ip ) d is about two times of the saturation magnetization 4 πM s . The dividing in-plane field (H ip ) d thus divides the influence of H ip on soft segments into two regions: high H ip region and low H ip region.

Influence of in-plane field on the stability of vertical Bloch line chains in hard domains of Garnet bubble films

The stability of vertical Bloch line (VBL) chains was statistically studied for all three types of hard domains in garnet bubble films subjected to an in-plane field Hip. With a set of integrate data taken from seven bubble samples and with two typical figures of a sample, four main features of the behavior of VBL chains subjected to Hip were summarized.

Influence of in-plane field on the critical temperature for the breakdown of vertical Bloch line chains

The influence of in-plane field Hip on the critical temperature To for the breakdown of vertical Bloch line (VBL) chains of hard domains in garnet bubble films has been investigated experimentally. It was found that To can be significantly reduced by the increase of Hip. Besides, the critical in-plane field H'ip for the breakdown of VBL chains was measured as a function of temperature T for the same sample. As a result, the correlation between these two critical parameters, To and H'ip, was found. By introducing an effective inplane field (Hip)e, the positive definiteness of the system of VBL pairs with two-dimensional magnetization distribution was analyzed, giving rise to a theoretical expression of H'ip (T): H'ip (T) =|4πMsQ(ao + a1Q + a2Q2 + a3Q3 + a4Q4)|T(To)Hip=o, where ai are constants. It agrees well with the experiments.

Nonuniform precessional motion of the domain wall under weak fields in arbitrary directions

Comprehensive analysis of the influence of a weak in-plane field on the dynamics of a planar domain wall in a uniaxial ferromagnet with a small quality factor has been carried out. The peculiarities of the domain-wall movement in both subcritical Hz&amp;lt;Hw regimes and supercritical regimes of the domain-wall movement are analyzed. Numerical calculations for yttrium-iron-garnet-like material have been carried out. It is shown that the influence of the in-plane field which is parallel to the domain wall is more pronounced than the influence of the field which is normal to the domain wall for a given type of magnetic material considered.

INFLUENCE OF IN-PLANE FIELDS ON THE FORMATION OF HARD BUBBLES

The influence of in-plane fields on the formation of hard bubbles in epitaxial garnet films by using single-pulse bias field was investigated in some detail. A critical in-plane field H0in which is related to the parameters of bubble films, was discovered. When Hin&gt;H0in, formation of hard bubbles no longer occurs. Three physical processes, i.e. the increase, quick decrease and slow decrease of the demarcation field for soft and hard bubble formation H[b] with in-plane fields can be qualitatively interpreted in terms of the effect of in-plane field on stripe domains, as well as the formation of multifingered domains.

Static properties of magnetic bubbles in garnet films with orthorhombic anisotropy

The static properties of bubbles in (110) oriented garnet films of composition (Gd, Y)3 (Fe, Mn, Ga)5O12 have been studied. The anisotropy in these films is orthorhombic with the easy axis of magnetization perpendicular to the plane of the film and a secondary easy axis in the plane of the film. Two types of bubbles can be distinguished, A-type bubbles having no Bloch lines and B-type bubbles with Bloch lines. Magnetic fields parallel to the in-plane easy axis of magnetization have a strong influence on the diameter and on the collapse field. Whereas the properties of the B-type bubbles are independent of the sign of this in-plane field, the properties of the A-type bubbles do depend on the sign of this in-plane field. B-type bubbles easily change state and become A-type under influence of in-plane fields. At zero in-plane field the collapse fields of B-type bubbles are about 1 to 3% larger than the collapse fields of A-type bubbles. A theory is presented that takes into account the interaction between in-plane field and domain wall magnetization. In this way the experimental data obtained for the A-type bubbles are reproduced very well. The difference between the collapse fields of A- and B-type bubbles in zero in-plane field is explained by taking into account the influence of stray fields and Bloch lines on the domain wall energy.

Strip domains in garnet films with large magnetostriction constants under the influence of in-plane fields

The influence of in-plane fields on the direction of strip domains in (Lu, Y, Gd) 3 (Fe, Mn, Ga) 5 O 12 films has been studied. These films were grown on