Compared to traditional single point hysteresis loop measuring instruments, the magneto-optical Kerr comprehensive testing platform can track real-time magnetic dynamic information of millions of points in the plane. Combined with the DC probe and high-frequency probe provided by the testing platform, the testing of samples is convenient. The current research in spintronics or magnetism has evolved from magnetic driven flipping to in-depth studies under a series of excitation sources such as direct current drive, pulse current drive, microwave pulse drive, and optical drive.

The standard system provided by Flash Technology follows a design philosophy of prioritizing performance and stability, which can meet the testing needs of various related materials in laboratory research and industrial production. The standard equipment provides multiple options such as magnetic field excitation and current excitation, making it a powerful testing platform for customers in spin characteristic research.

Typical test results of TTT-02 Kerr Microscope system

Module Introduction

Microscopic Magnetic Domain Measurement of Vertically Magnetoanisotropic Thin Films (Magnetic Domain Flip of Ferromagnetic/Ferromagnetic Thin Films)

(a) The sample Ta (4 nm)/CoFeB (0.7 nm)/MgO (2 nm)/Ta (2 nm) is driven by a magnetic field to achieve magnetic domain motion and flipping, with dendritic magnetic domains and clearly visible magnetic moment "1" and "0" information states. The colored ring represents the magnetic domain wall, and the white small arrow represents the direction of the magnetic moment in the N é el domain wall, indicating the direction of magnetic domain motion.

(b) The sample CoTb (6 nm)/Si N (4 nm) exhibits maze domains and isolated Skyrmions Bubbles near zero magnetic field. The size of a single stable Skyrmions Bubble in the figure is 1 μ m. To provide optical non-destructive detection support for SK-RM track memory research.

(a) Schematic diagram of longitudinal magneto-optical Kerr testing device for in-plane magnetic anisotropy samples.

(b) The sample Pt (4 nm)/Co (5 nm)/Ta (2 nm) is driven by a magnetic field to achieve magnetic domain motion and flipping, and the magnetic moment "1" and "0" information states are clearly visible.

(c) For the hysteresis loop of the sample, the vertical axis represents the normalized magneto-optical Kerr signal, and the horizontal axis represents the in-plane scanning magnetic field.

The discovery of two-dimensional ferromagnetic materials has opened the door to fundamental physics and next-generation spintronics. Their single crystal layered structure poses challenges to magnetic characterization, and the magneto-optical Kerr effect is a technical means to characterize their magnetic domain states.

The figure shows the flipping of two-dimensional magnetic material CrTe2 under magnetic field driving at 120K, and it is found that there are significant differences in the coercive force field (Hc) of CrTe2 with different layers.

TTT-02 Kerr Microscope is compatible with low temperatures and covers sample testing environments in the range of 5K-500K.

Current driven magnetic flipping

(a) Schematic diagram of FePt (10 nm) sample electrical transport characterization and magneto-optical Kerr synchronous testing device.

(b) And (c) current driven magnetic moment flipping and magnetic domain motion. Layering occurs along the growth direction of FePt thin film, presenting a staged flip, similar to how neural synapses receive multiple threshold information and transmit information.

By applying auxiliary fields Hx in different directions, the polarity of the sample's magnetic domains undergoes a reversal, as shown in Figure (b).

Magnetic domain imaging assisted measurement helps to achieve multi angle interpretation of anomalous signals in electrical transport signals, as well as the orientation and state of magnetic domains under threshold currents.