Experimental Investigation of On-Chip ESR Techniques in Multiple Temperature Regimes

The underlying physics and spin dynamics that govern magnetic molecules yield ideal behavior for their potential use as qubits in a quantum computer. To characterize the spin dynamics of these magnetic molecules, electron spin resonance (ESR) techniques are often used. In this study, a method in which the use of superconducting quantum interference devices (SQUIDs) and vibrating sample magnetometry (VSM) technologies can be combined with traditional ESR measurements is explored. This was achieved by modification of a commercial sample probe such that microwaves can effectively reach the sample under study. Additionally, the ability to tune the coupling parameter of a superconducting cavity is achieved through the use of temperature and magnetic field. This is of particular importance in on-chip ESR measurements and can be described by the losses in the device. This investigation describes a versatile setup which can be used to study a variety of magnetic molecules in multiple temperature regimes.