Voltage-controlled magnetic-based devices having topological insulator/magnetic insulator heterostructure

A method of operating a magnetic based device comprising a magnetic insulator having a first contact plane;

• a topological insulator adjacent the magnetic insulator at the first contact plane;
• magnetic dopants within the topological insulator;
• a first electrode at one side of the topological insulator at a second contact plane;
• and a second electrode at an opposite side of the topological insulator at a third contact plane, wherein the second contact plane and the third contact plane are orthogonal to the first contact plane, the method comprising:
• applying a switching voltage across the first electrode and the second electrode to generate an electric field through the topological insulator for a length of time sufficient to change a first magnetization direction of the magnetic insulator to a second magnetization direction opposite of the first magnetization direction.