Simultaneous polarized neutron reflectometry and anisotropic magnetoresistance measurements

Demeter, J.; Teichert, A.; Kiefer, K.; Wallacher, D.; Ryll, H.; Menéndez, E.; Paramanik, D.; Steitz, R.; Van Haesendonck, C.; Vantomme, A.; Temst, K.

doi:doi:10.1063/1.3541839

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Patterned anvils for high pressure measurements at low temperature

Multiprobe high pressure measurements require electrical leads in the sample chamber. Compared to conventional wire-based techniques, metallic tracks patterned onto the anvil surface improve reliability and ease of use, and enable novel and more demanding measurements under high pressure. We have developed new anvil designs based on sputter-deposited tracks on alumina and moissanite anvils. These anvils allow convenient and reliable measurements of electrical transport properties or of the magn...

Ultrahigh vacuum deposition of organic molecules by electrospray ionization

An electrospray apparatus for deposition of organic molecules on surfaces in ultrahigh vacuum is presented. The kinetic energy at the impact and mass to charge ratio of deposited ions can be controlled by an electrostatic quadrupole deflector and an in-line quadrupole mass spectrometer. With an ion funnel in the first two vacuum stages a high ion transmission is achieved. Experiments on porphyrin cations and deoxyribonucleic acid deposited on a Au(111) surface demonstrate the capabilities of th...

A novel experimental facility to carry out simultaneous polarized neutron reflectometry (PNR) and anisotropic magnetoresistance (AMR) measurements is presented. Performing both techniques at the same time increases their strength considerably. The proof of concept of this method is demonstrated on a CoO/Co bilayer exchange bias system. Although information on the same phenomena, such as the coercivity or the reversal mechanism, can be separately obtained from either of these techniques, the simultaneous application optimizes the consistency between both. In this way, possible differences in experimental conditions, such as applied magnetic field amplitude and orientation, sample temperature, magnetic history, etc., can be ruled out. Consequently, only differences in the fundamental sensitivities of the techniques can cause discrepancies in the interpretation between the two. The almost instantaneous information obtained from AMR can be used to reveal time-dependent effects during the PNR acquisition. Moreover, the information inferred from the AMR measurements can be used for optimizing the experimental conditions for the PNR measurements in a more efficient way than with the PNR measurements alone.

Article Outline

INTRODUCTION
POLARIZED NEUTRON REFLECTOMETRY
ANISOTROPIC MAGNETORESISTANCE
EXCHANGE BIAS IN CoO/Co BILAYERS
SAMPLE PREPARATION AND EXPERIMENTAL CONDITIONS
RESULTS AND DISCUSSIONS
CONCLUSIONS

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KEYWORDS and PACS

Keywords

cobalt, cobalt compounds, coercive force, enhanced magnetoresistance, exchange interactions (electron), magnetic multilayers, magnetisation reversal, neutron diffraction

PACS

75.70.Cn

Magnetic properties of interfaces (multilayers, superlattices, heterostructures)
75.47.-m

Magnetotransport phenomena; materials for magnetotransport
75.60.Jk

Magnetization reversal mechanisms
75.30.Et

Exchange and superexchange interactions
75.50.Vv

High coercivity materials
75.60.Ej

Magnetization curves, hysteresis, Barkhausen and related effects

ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1063/1.3541839

PUBLICATION DATA

ISSN

0034-6748 (print)

1089-7623 (online)

Publisher

$abstract.society.value is a Member of CrossRef

American Institute of Physics

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