having an energy storage device which collects the energy transported during the flowing of a write or read current and makes it available for a new write or read operation application_number US 49340004 A description the following list of symbols is used consistently throughout the text and drawings fig1 illustrates a memory circuit arranged according to an exemplary embodiment of the present invention in this case the individual memory cells or resistors rc comprise so called mtj mtj magnetic tunnel junction layer sequences in which a tunnel layer is located between two magnetoresistive layers in circuit 100 each individual resistor rc 102 lies between a word line wl 104 and a bit line bl 106 a total of m word lines 104 and n bit lines 106 are provided in the memory cell array 1 a selected cell 110 represented by a black filled in resistor rc lies for example between word line 104 designated as wl3 and the bit line 106 designated as bl3 cell 110 is selected by a specific voltage difference being applied to word line wl3 and bit line bl3 a generator device in the form of an energy storage system 2 3 4 5 is provided on each side of memory cell array 1 these energy storage systems 2 3 4 5 each comprise an energy storage unit 112 e2 113 e3 114 e4 and 115 e5 respectively and a multiplexer 122 mux2 123 mux3 124 mux4 and 125 mux5 energy storage system 2 for example comprises energy storage unit 112 and the multiplexer 122 each energy storage unit 112 u2013 115 comprises capacitors 131 c1 132 c2 which can be converted from a series circuit into a parallel circuit by means of a switch pair 134 s in this.