A plot of magnetising force versus resultant magnetization (also called a B/H curve) of the material as it is successively magnetised to saturation, demagnetized, magnetised in the opposite direction and finally remagnetized. With continued recycles, this plot will be a closed loop which completely describes the characteristics of the magnetic material. The size and shape of this "loop" is important for both hard and soft materials. With soft materials, which are generally used in alternating circuits, the area inside this "loop" should be as thin as possible (it is a measure of energy loss). But with hard materials the "fatter" the loop, the stronger the magnet will be. The first quadrant of the loop (that is +X and +Y) is called the magnetization curve. It is of interest because it shows how much magnetising force must be applied to saturate a magnet. The second quadrant (+X and -Y) is called the Demagnetization Curve.