The use of a mesosurface manufactured by a method comprising the steps of: I. providing a substrate which exhibits at least two distinct measurable states of an electron spin property and which can stably but reversibly be transitioned from i. a first state of the electron spin property into at least ii. one second state of the electron spin property which is measurably distinct from the first state, II. creating on a surface of the substrate at least one area i. outside of which the substrate is in the first state of the electron spin property, and ii. inside of which the substrate is in one of the at least one second state of the electron spin property, or iii. wherein the states of the electron spin property of the inside area and the outside area are inverted, and III. wherein in step II.ii a desired to be inside area is defined and delineated on the surface of the substrate which is in the first state of the electron spin property and wherein subsequently the surface in the defined and delineated inside area is contacted with a liquid which reacts with the substrate material to yield in or to bring about the transition into the at least one second state of the electron spin property within the inside area only, or wherein in step II.iii the states of the electron spin property of the surface and the inside area are inverted, wherein IV. the individual area of the at least one area has a size of <3 μm 2 and/or wherein multiple areas form one array or more arrays of areas of regular or irregular shapes of any size, in a magnetic racetrack. I. providing a substrate which exhibits at least two distinct measurable states of an electron spin property and which can stably but reversibly be transitioned from i. a first state of the electron spin property into at least ii. one second state of the electron spin property which is measurably distinct from the first state, i. a first state of the electron spin property into at least ii. one second state of the electron spin property which is measurably distinct from the first state, II. creating on a surface of the substrate at least one area i. outside of which the substrate is in the first state of the electron spin property, and ii. inside of which the substrate is in one of the at least one second state of the electron spin property, or iii. wherein the states of the electron spin property of the inside area and the outside area are inverted, and i. outside of which the substrate is in the first state of the electron spin property, and ii. inside of which the substrate is in one of the at least one second state of the electron spin property, or iii. wherein the states of the electron spin property of the inside area and the outside area are inverted, and III. wherein in step II.ii a desired to be inside area is defined and delineated on the surface of the substrate which is in the first state of the electron spin property and wherein subsequently the surface in the defined and delineated inside area is contacted with a liquid which reacts with the substrate material to yield in or to bring about the transition into the at least one second state of the electron spin property within the inside area only, or wherein in step II.iii the states of the electron spin property of the surface and the inside area are inverted, wherein IV. the individual area of the at least one area has a size of <3 μm 2 and/or wherein multiple areas form one array or more arrays of areas of regular or irregular shapes of any size, in a magnetic racetrack.