Magnetoelastic anisotropy of antiferromagnetic materials

Abstract

Antiferromagnetic (AFM) materials are of great interest for spintronics. Here, we report the magnetoelastic anisotropy of an AFM IrMn thin film. An exchange-biased CoFeB/IrMn bilayer was used to obtain a single domain of the AFM thin film, and the magnetic moment arrangement of the AFM layer was deduced from the magnetic hysteresis loop of the pinned FM layer. A uniaxial compressive stress is applied on the thin film through changing the temperature due to the anisotropic thermal expansion of the polyvinylidene fluoride (PVDF) substrate. Both experimental results and theoretical calculations show that the direction of IrMn magnetic moment can be changed when a compressive stress is applied and the direction of IrMn AFM moment rotates about 10° under 2.26 GPa compressive stress. These results provide important information for the practical application of flexible spintronics based on AFM spintronic devices.

Enhanced Stress Stability in Flexible Co/Pt Multilayers with Strong Perpendicular Magnetic Anisotropy

“…Until now, there have been a large number of studies on the influence of stress on the magnetic anisotropy in flexible magnetic thin films. For example, Dai et al deposited Fe 81 Ga 19 films on flexible polyethylene terephthalate (PET) substrates; they found that the magnetic easy (hard) axis can be tuned to the hard (easy) axis by bending the flexible substrate. , In addition to FeGa, many other flexible magnetic films such as CoFeB, Fe, Co, and Ni films have been found to show significant magnetic anisotropy change upon mechanical stress, which deteriorates the performance of flexible magnetoelectronic devices. − Therefore, finding solutions to reducing the adverse effect of mechanical stress on magnetic anisotropy is quite demanding.…”

“…The β-type PVDF crystals contain two parallel molecular chains in the orthorhombic unit cell, which leads to distinct thermal expansion coefficients along the α 31 and α 32 directions in the film plane . Our previous studies demonstrated that due to the anisotropic thermal expansion of PVDF, a uniaxial stress can be generated and transferred to the film simply by changing the temperature of PVDF substrate. , The thermal expansion coefficient α can be expressed as α = 1 L 0 × normalΔ L normalΔ T where Δ L is the change of the length when the temperature change is Δ T and L 0 is the original length of PVDF. The temperature-dependent deformation is shown in Figure S5.…”

Evaluation of Metglas/polyvinylidene fluoride magnetoelectric bilayer composites for flexible in-plane resonant magnetic sensors

“…On the other hand, the bending of the sample makes the piezoelectric layer generate a small quantity of charge. It is universally received that the small quantity of charge directly reduces the intensity of polarization, producing a weak electric field, which induces a decrease in the ME effect [60][61][62][63][64]. Moreover, the resonance frequency increases with the increasing φ, which results mainly from the change of mechanical boundary conditions.…”

Sensitive angle-dependent magnetoelectric coupling in cluster-assembled flexible composites

“…Cluster-assembled composites have recently gained increasing attention because of their unique structural compatibility and stability [10,11]. In addition there are various other phenomena and devices related to magnetic anisotropy, but the origin is beyond the theoretical scope of crystal polycrystalline symmetry [12][13][14][15]. Thus, clarifying the origin and further obtaining high-strength magnetoelastic anisotropy are crucially important not only for the fundamental magnetism but also for the design of flexible ME composites.…”