RECENT NEWS ON GUFP AND THE FINDING OF THE LINEAR ASYMMETRIC ORDER OF THE LINEAR ANTIPHASE BOUNDARY IN Fe_3O_4 WITH THE IDEA OF THE NEW NANOMETER MASS MEMORY BY NEW IRON-GROUP OXIDES

摘要

GUFP has made a fantastic development in recent years in almost all basic areas of physics. Therefore, a short introduction of them has been presented in front of the paper. The idea of the new mass memory comes from the geometrical study of the anti-phase structure of the low temperature phase of Fe_3O_4 , whose transition temperature is around 125K. We found that the anti-phases exist intrinsically and, if α- and γ- anti-phases coexist and can have a corner boundary line along a-axis, we have the straight line sequence of Fe~(2+) and Fe~(3+) ions alternatively. There are two configurations in which Fe~(2+) and Fe~(3+) are exchanged. One essential finding is that the nearest neighbor configurations of these two lines are different. Therefore, we can assign 0 and 1 to either of the configurations. The switching of the configuration will be expected by applying a suitable electric, field pulse or pulses. The length of the line and the density of the lines for a unit memory must be determined so as to make for the device to be able to operate most effectively. Fe_3O_4 may be not the best material for this device and other iron-group oxides with the effective ordering critical temperature higher than the room temperature should be investigated. Even if there is no other material than Fe_3O_4 , the expected minimum area for the one unit with the maximum density of the devices may be 4 nm 4 nm , that must be charming for the super-computers.