Magnetic Force bending only outwards and not inwards in a magnetic microgripper

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Hi I am having problems simulating the bending behavior of a magnetized Hyperelastic Material (PDMS) subject to a magnetic field created by a coil and amplified by a permanent magnet. In the attachments you can also see a picture taken from a paper representing the expected physics of the grippers. The problem is in my simulation, even if the B field is pointing inwards , the strips are bending outwards as a result (like you see in the second picture of the simulation). Why the direction of the field is not taken into account for the final force on the grippers? And how can i fix that?



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