title: Note: Highly sensitive superconducting quantum interference device microsusceptometers operating at high frequencies and very low temperatures inside the mixing chamber of a dilution refrigerator.
abstract: We report the experimental results that show the operation of superconducting quantum interference device (SQUID) microsusceptometers immersed in the (3)He-(4)He mixture inside the mixing chamber of a dilution refrigerator at high frequency (1 MHz) and down to very low temperatures (13 mK). The devices are based on highly sensitive and easy-to-use commercial SQUID sensors. The integrated susceptometers are fabricated by rerouting some connections of the SQUID's input circuit. Examples of measurements on molecular magnets Mn(12) and HoW(10) are shown.
authors.affiliation: Instituto de Ciencia de Materiales de Aragón, CSIC-University of Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.
authors.forename: M J
authors.initials: MJ
authors.lastname: Martínez-Pérez
authors.forename: J
authors.initials: J
authors.lastname: Sesé
authors.forename: F
authors.initials: F
authors.lastname: Luis
authors.forename: D
authors.initials: D
authors.lastname: Drung
authors.forename: T
authors.initials: T
authors.lastname: Schurig