20 research outputs found
Complex temperature dependence of coupling and dissipation of cavity-magnon polaritons from milliKelvin to room temperature
Hybridized magnonic-photonic systems are key components for future
information processing technologies such as storage, manipulation or conversion
of data both in the classical (mostly at room temperature) and quantum
(cryogenic) regime. In this work, we investigate a YIG sphere coupled strongly
to a microwave cavity over the full temperature range from
down to . The cavity-magnon polaritons are studied from the
classical to the quantum regime where the thermal energy is less than one
resonant microwave quanta, i.e. at temperatures below . We
compare the temperature dependence of the coupling strength ,
describing the strength of coherent energy exchange between spin ensemble and
cavity photon, to the temperature behavior of the saturation magnetization
evolution and find strong deviations at low temperatures. The
temperature dependence of magnonic disspation is governed at intermediate
temperatures by rare earth impurity scattering leading to a strong peak at
K. The linewidth decreases to MHz at mK,
making this system suitable as a building block for quantum electrodynamics
experiments. We achieve an electromagnonic cooperativity in excess of over
the entire temperature range, with values beyond in the milliKelvin
regime as well as at room temperature. With our measurements, spectroscopy on
strongly coupled magnon-photon systems is demonstrated as versatile tool for
spin material studies over large temperature ranges. Key parameters are
provided in a single measurement, thus simplifying investigations
significantly.Comment: 10 pages , 9 figures in tota
Steering between level repulsion and attraction: broad tunability of two-port driven cavity magnon-polaritons
Cavity-magnon polaritons (CMPs) are the associated quasiparticles of the hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. In the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. This renders CMPs as promising candidates for future applications such as in information processing. Recent advances on the study of the CMP now allow not only for creation of CMPs on demand, but also for tuning of the coupling strength—this can be thought of as the enhancement or suppression of information exchange. Here, we go beyond standard single-port driven CMPs and employ a two-port driven CMP. We control the coupling strength by the relative phase ϕ and amplitude field ratio δ0 between both ports. Specifically, we derive a new expression from input–output theory for the study of the two-port driven CMP and discuss the implications on the coupling strength. Furthermore, we examine intermediate cases where the relative phase is tuned between its maximal and minimal value and, in particular, the high δ0 regime, which has not been yet explored
Control of the Coupling Strength and the Linewidth of a Cavity-Magnon Polariton
The full coherent control of hybridized systems such as strongly coupled
cavity photon-magnon states is a crucial step to enable future information
processing technologies. Thus, it is particularly interesting to engineer
deliberate control mechanisms such as the full control of the coupling strength
as a measure for coherent information exchange. In this work, we employ cavity
resonator spectroscopy to demonstrate the complete control of the coupling
strength of hybridized cavity photon-magnon states. For this, we use two
driving microwave inputs which can be tuned at will. Here, only the first input
couples directly to the cavity resonator photons, whilst the second tone
exclusively acts as a direct input for the magnons. For these inputs, both the
relative phase and amplitude can be independently controlled.
We demonstrate that for specific quadratures between both tones, we can
increase the coupling strength, close the anticrossing gap, and enter a regime
of level merging. At the transition, the total amplitude is enhanced by a
factor of 1000 and we observe an additional linewidth decrease of at
resonance due to level merging. Such control of the coupling, and hence
linewidth, open up an avenue to enable or suppress an exchange of information
and bridging the gap between quantum information and spintronics applications.Comment: 9 pages, 6 figure
Steering between level repulsion and attraction : broad tunability of two-port driven cavity magnon-polaritons
Cavity-magnon polaritons (CMPs) are the associated quasiparticles of the hybridization between cavity photons and magnons in a magnetic sample placed in a microwave resonator. in the strong coupling regime, where the macroscopic coupling strength exceeds the individual dissipation, there is a coherent exchange of information. this renders cmps as promising candidates for future applications such as in information processing. recent advances on the study of the cmp now allow not only for creation of cmps on demand, but also for tuning of the coupling strength-this can be thought of as the enhancement or suppression of information exchange. here, we go beyond standard single-port driven cmps and employ a two-port driven cmp. we control the coupling strength by the relative phase phi and amplitude field ratio delta(0) between both ports. specifically, we derive a new expression from input-output theory for the study of the two-port driven cmp and discuss the implications on the coupling strength. furthermore, we examine intermediate cases where the relative phase is tuned between its maximal and minimal value and, in particular, the high delta(0) regime, which has not been yet explored
Probing the Tavis-Cummings level splitting with intermediate-scale superconducting circuits
We demonstrate the local control of up to eight two-level systems interacting
strongly with a microwave cavity. Following calibration, the frequency of each
individual two-level system (qubit) is tunable without influencing the others.
Bringing the qubits one by one on resonance with the cavity, we observe the
collective coupling strength of the qubit ensemble. The splitting scales up
with the square root of the number of the qubits, which is the hallmark of the
Tavis-Cummings model. The local control circuitry causes a bypass shunting the
resonator, and a Fano interference in the microwave readout, whose contribution
can be calibrated away to recover the pure cavity spectrum. The simulator's
attainable size of dressed states with up to five qubits is limited by reduced
signal visibility, and -- if uncalibrated -- by off-resonance shifts of
sub-components. Our work demonstrates control and readout of quantum coherent
mesoscopic multi-qubit system of intermediate scale under conditions of noise
Magnons at low excitations: Observation of incoherent coupling to a bath of two-level-systems
Collective magnetic excitation modes, magnons, can be coherently coupled to
microwave photons in the single excitation limit. This allows for access to
quantum properties of magnons and opens up a range of applications in quantum
information processing, with the intrinsic magnon linewidth representing the
coherence time of a quantum resonator. Our measurement system consists of a
yttrium iron garnet (YIG) sphere and a three-dimensional (3D) microwave cavity
at temperatures and excitation powers typical for superconducting quantum
circuit experiments. We perform spectroscopic measurements to determine the
limiting factor of magnon coherence at these experimental conditions. Using the
input-output formalism, we extract the magnon linewidth . We
attribute the limitations of the coherence time at lowest temperatures and
excitation powers to incoherent losses into a bath of near-resonance two-level
systems (TLSs), a generic loss mechanism known from superconducting circuits
under these experimental conditions. We find that the TLSs saturate when
increasing the excitation power from quantum excitation to multi-photon
excitation and their contribution to the linewidth vanishes. At higher
temperatures, the TLSs saturate thermally and the magnon linewidth decreases as
well
Gilbert damping of CoFe-alloys
We report structural, magnetic and dynamic properties of polycrystalline coxfe1-x-alloy films on sapphire, silicon, and mgo substrates across the full composition range, by using a vector network analyser ferromagnetic resonance measurement technique (vna-fmr), superconducting quantum interference device magnetometry (squid) and x-ray diffraction (xrd). in the approximate vicinity of 28% co, we observe a minimum of the damping parameter, associated with a reduction in the density of states to a minimum value at the fermi energy level. for films on all substrates, we find magnetic damping of the order of 4-5 . 10(-3), showing that the substrate does not play a major role. using a post-annealing process, we report a decrease of the magnetic damping down to 3-4 . 10(-3). we find that the saturation magnetization depends approximately reciprocally on the damping parameter with varying alloy composition
Introducing coherent time control to cavity magnon-polariton modes
By connecting light to magnetism, cavity magnon-polaritons (CMPs) can link quantum computation to spintronics. Consequently, CMP-based information processing devices have emerged over the last years, but have almost exclusively been investigated with single-tone spectroscopy. However, universal computing applications will require a dynamic and on-demand control of the CMP within nanoseconds. Here, we perform fast manipulations of the different CMP modes with independent but coherent pulses to the cavity and magnon system. We change the state of the CMP from the energy exchanging beat mode to its normal modes and further demonstrate two fundamental examples of coherent manipulation. We first evidence dynamic control over the appearance of magnon-Rabi oscillations, i.e., energy exchange, and second, energy extraction by applying an anti-phase drive to the magnon. Our results show a promising approach to control building blocks valuable for a quantum internet and pave the way for future magnon-based quantum computing research
Interfacial Dzyaloshinskii-Moriya interaction and chiral magnetic textures in a ferrimagnetic insulator
The interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayers of heavy metal and ferromagnetic metals enables the stabilization of novel chiral spin structures such as skyrmions. Magnetic insulators, on the other hand, can exhibit enhanced dynamics and properties such as lower magnetic damping and therefore it is of interest to combine the properties enabled by interfacial DMI with insulating systems. Here, we demonstrate the presence of interfacial DMI in heterostructures that include insulating magnetic layers. We use perpendicularly magnetized insulating thulium iron garnet (TmIG) films capped by the heavy metal platinum, grown on gadolinium gallium garnet (GGG) substrates, and find a surprisingly strong interfacial DMI that, combined with spin-orbit torque, results in efficient switching. The interfacial origin is confirmed through thickness-dependence measurements of the DMI, revealing the characteristic 1/thickness dependence. We combine chiral spin structures and spin-orbit torques for efficient switching and identify skyrmions that allow us to establish the GGG/TmIG interface as the possible origin of the DMI