BHHystereseKurve

BHHystereseKurve is the term used to describe the magnetic hysteresis curve, which expresses the relationship between magnetic flux density B and magnetic field strength H in magnetic materials, especially ferromagnets. In typical representations B is plotted against H, with B measured in tesla (T) and H in amperes per meter (A/m). The curve is generated by cycling the external field H from negative to positive saturation and back, resulting in a closed loop rather than a single line.

The loop arises from the delayed and irreversible response of magnetic domains to changes in H. As H increases, domains align and B grows toward saturation; when H decreases and reverses, the path does not retrace itself. This lag leads to hysteresis. Important features of the BHHystereseKurve include the remanent flux density Br, which is the value of B at H = 0, and the coercive field Hc, the field strength required to bring B to zero. The area enclosed by the major hysteresis loop corresponds to energy losses (hysteresis loss) per cycle.

Material dependence and categorization are central. Soft magnetic materials exhibit narrow, low-loop-area curves with small Hc and Br, suitable for efficient transformers and high-frequency devices. Hard magnetic materials show wide loops with large Br and Hc, making them suitable as permanent magnets. Minor loops can occur when H is cycled within a limited range, revealing path-dependent magnetization behavior.

Applications and measurement: the BHHystereseKurve is used to characterize magnetic properties, select materials for inductors, transformers, and magnets, and quantify energy losses. It is typically obtained with magnetometry techniques and controlled field cycling.