On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

Abstract

Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic Weyl semimetal Co 3 Sn 2 S 2 , we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co 3 Sn 2 S 2 or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with Weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.

Development of high precision digital magnetometer

“…Hall elements are generally made of N-type semiconductor single crystal materials such as germanium, indium antimonide and indium arsenide. Because the output signal of indium arsenide element is not as large as that of indium antimonide element, the influence of temperature is smaller than that of indium antimonide element, and the linearity is also better [2] . Therefore, this instrument uses indium arsenide as Hall sensor.…”

“…The circuit can drive a relatively large load resistance, which is not limited by the operational amplifier. The output current as in (2). Changing the value of resistance R41 can change the current value.…”

Pressure‐Driven Magneto‐Topological Phase Transition in a Magnetic Weyl Semimetal

“…In this study, we focus on the TPT and apply high pressure to investigate the evolution of topological states in a Co 3 Sn 2 S 2 Weyl magnet. Since its discovery, [21][22][23][24] significant topological characteristics, including giant anomalous Hall effects (AHEs), [21,22] anomalous Nernst effects, [25,26] surface Fermi arcs, [23,24] chiral edge states, [27,28] giant magneto-optical Kerr effects, [29] spin-orbit polaron, [30] low-resistance state/exceptional Hall component, [31] spin wave gap, [32] and anisotropic magnetoelastic response [33] have been observed in Co 3 Sn 2 S 2 , rendering it an ideal platform for TPTs with TRS breaking and restoration. Recently, pressure studies have been performed to adjust the giant AHE of Co 3 Sn 2 S 2 , where it is discovered that the intrinsic mechanism-dominated AHE decreased during pressure loading.…”

Structural Determination, Unstable Antiferromagnetism and Transport Properties of Fe-Kagome Y0.5Fe3Sn3 Single Crystals

“…Co-based Kagome material Co3Sn2S2 is confirmed as the first magnetic Weyl semimetal, behaving giant anomalous Hall effect, negative magnetoresistance effect and so on. [2][3][4][5] Mn-based Kagome material Mn3𝑋 (𝑋 = Ge, Sn) is a non-collinear antiferromagnet with Weyl fermions, which surprisingly exhibits large anomalous Hall effect and anomalous Nernst effect. [6][7][8][9] The most popular material in condensed matter physics in the past two years is V-based Kagome material 𝐴V3Sb5 (𝐴 = K, Rs, Cs) because of the topological superconductivity, [10][11][12][13][14][15] while newly reported Rubased Kagome material YRu3Si2 is a type-II superconductor with strong electron correlations.…”