Magnetic and mechanical properties of ultrafine Fe/Cu laminates produced by repeated rolling

The bulk Fe/Cu multilayer laminates with an Fe layer thickness of about 80n m have been successfully produced by repeated hot- and cold-rolling from a macroscopic stack of metal sheets. The stacks adjusted to 17 wt% Cu and the balance Fe metal sheets were hot-rolled and reduced 98% by cold rolling. T he Fe/Cu laminates were then tempered at a temperature of 1050 degrees C fo r a laminate thickness of 1mm, cold-rolled again to a thickness of 0.07 mm and aged at 450 degrees C. The Fe/Cu multilayer laminates exhibited a high coercive force of 23 Oe, a residual flux density of 15 kG, a maximum flux d ensity of 17 kG, and a squareness ratio of 0.87 parallel to the rolling dir ection with maximum strength of 1249 MPa. This material could be used as a semi-magnetic material by application of the dynamic change in its magnetiz ation by an external magnetic field, as in a latching relay for electric au tomatic exchange and semi-fixing memory to memorize information and repeate dly read it out.