Photon-induced magnetization reversal in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mn>8</mml:mn></mml:msub></mml:mrow></mml:mrow></mml:math>single-molecule magnet

Bal, M.; Friedman, Jonathan R.; Suzuki, Yoko; Mertes, K. M.; Rumberger, E. M.; Hendrickson, David N.; Myasoedov, Y.; Shtrikman, Hadas; Avraham, Nurit; Zeldov, E.

doi:10.1103/physrevb.70.100408

Cited by 34 publications

(26 citation statements)

References 23 publications

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“…Electron paramagnetic resonance (EPR) methods are combined with highsensitivity magnetization measurements. The magnetization detection could also be a Hall-probe magnetometer [12,13,14,15,16], a standard SQUID [17] or a vibrating sample magnetometer [18]. We found very narrow resonant photon absorption lines which are mainly broadened by hyperfin interactions.…”

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confidence: 99%

“…Electron paramagnetic resonance (EPR) methods are combined with highsensitivity magnetization measurements. The magnetization detection could also be a Hall-probe magnetometer [12,13,14,15,16] The measurements were made in a dilution cryostat using a 20 µm sized single crystal of Cr 7 Ni. The magnetic probe was a micro-SQUID array [11,19] equipped with three coils allowing to apply a field in any direction and with sweep rates up to 10 T/s.…”

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Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

et al. 2005

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Presented are magnetization measurements on a crystal of Cr7Ni antiferromagnetic rings. Irradiation with microwaves at frequencies between 1 and 10 GHz leads to observation of very narrow resonant photon absorption lines which are mainly broadened by hyperfin interactions. A two-pulse hole burning technique allowed us to estimate the characteristic energy diffusion time.PACS numbers: 75.50. Xx, 75.60.Jk, 75.75.+a, Magnetic molecules are currently considered among the most promising electron spin based quantum systems for the storing and processing of quantum information [1]. For this purpose, ferromagnetic [2] and antiferromagnetic [3,4] systems have attracted an increasing interest [5,6,7]. In the latter case the quantum hardware is thought of as a collection of coupled molecules, each corresponding to a different qubit. The main advantages would arise from the fact that they are extremely small and almost identical, allowing to obtain, in a single measurement, statistical averages of a larger number of qubits. The magnetic properties can be modelled with an outstanding degree of accuracy. And most importantly, the desired physical properties can be engineered chemically.Recently, the suitability of Cr-based antiferromagnetic molecular rings for the qubit implementation has been proposed [5,6,7]. The substitution of one metal ion in a Cr-based molecular ring with dominant antiferromagnetic couplings allowed to engineer its level structure and ground-state degeneracy [8,9]. A Cr 7 Ni molecular ring was characterized by means of low-temperature specificheat and torque-magnetometry measurements, thus determining the microscopic parameters of the corresponding spin Hamiltonian. The energy spectrum and the suppression of the leakage-inducing S-mixing render the Cr 7 Ni molecule a suitable candidate for the qubit implementation [6,7,10].In this paper we report the first micro-superconducting quantum interference device (micro-SQUID) [11] studies of the Cr 7 Ni molecular ring. Electron paramagnetic resonance (EPR) methods are combined with highsensitivity magnetization measurements. The magnetization detection could also be a Hall-probe magnetometer [12,13,14,15,16] The measurements were made in a dilution cryostat using a 20 µm sized single crystal of Cr 7 Ni. The magnetic probe was a micro-SQUID array [11,19] equipped with three coils allowing to apply a field in any direction and with sweep rates up to 10 T/s. The electromagnetic radiation was generated by a frequency synthesizer (Anritsu MG3694A) triggered with a nanosecond pulse generator. This setup allows to vary continuously the frequency from 0.1 Hz to 20 GHz, with pulse lengths form ∼1 ns to continuous radiation [20]. Using a 50 µm sized gold radio frequency (RF) loop, the RF radiation field was directed in a plane perpendicular to the applied static field µ 0 H. The microwave power of the generator could be varied from -80 to 20 dBm (10 −11 to 10 −1 W). The sample absorbes only a small fraction of the generator power. This fraction is however proportional t...

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“…Electron paramagnetic resonance (EPR) methods are combined with highsensitivity magnetization measurements. The magnetization detection could also be a Hall-probe magnetometer [12,13,14,15,16] The measurements were made in a dilution cryostat using a 20 µm sized single crystal of Cr 7 Ni. The magnetic probe was a micro-SQUID array [11,19] equipped with three coils allowing to apply a field in any direction and with sweep rates up to 10 T/s.…”

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Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

et al. 2005

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“…This technique also allows the precise control over the excitation of the sample and makes it possible to quantify the nonresonant heating. [12] The magnetization sensor can be either a Hall magnetometer [5,13], a micrometer sized superconducting quantum inference device (SQUID) [14], a standard SQUID [15] or an inductive pickup loop [16]. Differences in these techniques lie mainly in the rapidity and sensitivity of the measurement, in the possibility of applying magnetic fields, and in the compatibility with microwaves.…”

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Magnetization dynamics in the single-molecule magnetFe8under pulsed microwave irradiation

et al. 2007

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We present measurements on the single molecule magnet Fe8 in the presence of pulsed microwave radiation at 118 GHz. The spin dynamics is studied via time resolved magnetization experiments using a Hall probe magnetometer. We investigate the relaxation behavior of magnetization after the microwave pulse. The analysis of the experimental data is performed in terms of different contributions to the magnetization after-pulse relaxation. We find that the phonon bottleneck with a characteristic relaxation time of ∼ 10 − 100 ms strongly affects the magnetization dynamics. In addition, the spatial effect of spin diffusion is evidenced by using samples of different sizes and different ways of the sample's irradiation with microwaves.

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“…The discrete level structure also permits radiation to drive transitions between states. Recent experiments show that microwave radiation can be used to enhance the rate for magnetization reversal [5,6] and change the equilibrium magnetization [7][8][9][10][11]. Much of this research is aimed at studying the spin dynamics of singlemolecule magnets in the presence of radiation with the goal of observing coherent dynamics such as Rabi oscillations and measuring the characteristic spin relaxation time T 1 and decoherence time T 2 .…”

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“…-In previous work [9], we used a low-power radiation source and found small changes (less than 1%) in the magnetization whenever the radiation frequency matched the energy difference between the ground and first excited states. Here we increased the radiation amplitude both by using a high-power backward-wave oscillator source and a rectangular cavity with a Q as high as 2500.…”

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Non-equilibrium magnetization dynamics in the Fe ₈ single-molecule magnet induced by high-intensity microwave radiation

et al. 2005

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PACS. 75.50.Xx -Molecular magnets. PACS. 76.30.-v -Electron paramagnetic resonance and relaxation. PACS. 75.45.+j -Macroscopic quantum phenomena in magnetic systems.Abstract. -Resonant microwave radiation applied to a single crystal of the molecular magnet Fe8 induces dramatic changes in the sample's magnetization. Transitions between excited states are found even though at the nominal system temperature these levels have negligible population. We find evidence that the sample heats significantly when the resonance condition is met. In addition, heating is observed after a short pulse of intense radiation has been turned off, indicating that the spin system is out of equilibrium with the lattice.Introduction. -Unlike classical magnets, single-molecule magnets, with spin values on the order of 10, have a discrete energy-level structure. This allows for the observation of resonant tunneling between "up" and "down" orientations when energy levels are brought into resonance by an external magnetic field [1-4]. The discrete level structure also permits radiation to drive transitions between states. Recent experiments show that microwave radiation can be used to enhance the rate for magnetization reversal [5,6] and change the equilibrium magnetization [7][8][9][10][11]. Much of this research is aimed at studying the spin dynamics of singlemolecule magnets in the presence of radiation with the goal of observing coherent dynamics such as Rabi oscillations and measuring the characteristic spin relaxation time T 1 and decoherence time T 2 . Measurements of these parameters are essential for determining whether single-molecule magnets are viable as potential qubits [12].In this letter, we show that high-amplitude radiation can induce dramatic changes in the equilibrium magnetization of the molecular magnet Fe 8 when the radiation frequency matches the energy difference between various energy levels in the system. This allows us to

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Photon-induced magnetization reversal in theFe8single-molecule magnet

Cited by 34 publications

References 23 publications

Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

Magnetization dynamics in the single-molecule magnetFe8under pulsed microwave irradiation

Non-equilibrium magnetization dynamics in the Fe ₈ single-molecule magnet induced by high-intensity microwave radiation

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Photon-induced magnetization reversal in theFe8single-molecule magnet

Cited by 34 publications

References 23 publications

Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

Resonant photon absorption and hole burning inCr7Niantiferromagnetic rings

Magnetization dynamics in the single-molecule magnetFe8under pulsed microwave irradiation

Non-equilibrium magnetization dynamics in the Fe 8 single-molecule magnet induced by high-intensity microwave radiation

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Non-equilibrium magnetization dynamics in the Fe ₈ single-molecule magnet induced by high-intensity microwave radiation