On the control of spin flop in synthetic antiferromagnetic films

Négulescu, B.; Lacour, Daniel; Hehn, M.; Gerken, A.; Paul, J.C.; Duret, C.

doi:10.1063/1.3583584

Cited by 16 publications

(5 citation statements)

References 25 publications

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“…13,30 In a field of À400 mT, the device is almost in the parallel state, but the noise magnitude increases on increasing the field, which is related to the spin flop configuration adapted by the SAF in a range of field around À200 mT. 22,23 As shown in Fig. 1(b), the magnetization of the lower pinned layer is properly saturated when the magnetic field changes from À400 to À50 mT.…”

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confidence: 90%

Tunable linear magnetoresistance in MgO magnetic tunnel junction sensors using two pinned CoFeB electrodes

Chen

Feng

Coey

2012

Applied Physics Letters

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MgO-barrier magnetic tunnel junction sensors with both CoFeB layers pinned by IrMn have been fabricated, which show a tunneling magnetoresistance (TMR) of up to 255% at room temperature. The perpendicular configuration for magnetic field sensing is set using a two-step field annealing process. The linear TMR field range and sensitivity are tuned by inserting an ultrathin Ru layer between the upper IrMn and the top-pinned CoFeB layer. The field sensitivity reaches 26%/mT, while the noise detectivity is about 90 nT/Hz at 10 Hz for a 0.3 nm Ru insertion layer. The bias dependence of the noise suggests that this is a useful design for sensor applications.

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confidence: 90%

Tunable linear magnetoresistance in MgO magnetic tunnel junction sensors using two pinned CoFeB electrodes

Chen

Feng

Coey

2012

Applied Physics Letters

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“…Figure shows the hysteresis profile with a typical spin‐flop (e.g., ) appearance for an independent SAF structure. Here, we deliberately sought to give an example whereby there are clear hysteresis losses.…”

Section: Synthetic Antiferromagnetic Nanoparticlesmentioning

confidence: 99%

“…The incorrect magnetic fields could incur the development of exaggerated reactions from the immune system, detrimental to recovery and with the heightened possibility of autoimmune and chronic inflammatory diseases emerging. Figure 5 shows the hysteresis profile with a typical spinflop (e.g., [8,13,14]) appearance for an independent SAF structure. Here, we deliberately sought to give an example whereby there are clear hysteresis losses.…”

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confidence: 99%

The nano‐mechanics and magnetic properties of high moment synthetic antiferromagnetic particles

Forrester

Kusmartsev

2014

Physica Status Solidi (a)

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Phone: þ44 (0) 1509 228208With nanomagnets increasingly being used and proposed as functional units for in vivo applications, it is vital to understand how to optimize their structure, geometry, and size, and their responses to electromagnetic stimulation. Herein, we predicate how to do so for synthetic antiferromagnetic structures that are subjected to external magnetic control. Because the structures are on the scale of biological entities, interactions with cells and molecular constituents can be extreme and careful design must be undertaken to avoid detrimental effects. Thus, the magnetic responses of multilayers, as demonstrated in experiments by Koh et al. [e.g., Hu et al., Adv. Mater. 20, 1479 and Koh et al., J. Appl. Phys. 107, 09B522 (2010)], are understood using a fully dynamical investigation based on LandauLifshitz-Gilbert equations. We find that during the fabrication of the structures the axial positions of the nanomagnets become offset from each other, leading to the characteristic magnetic hysteresis shapes witnessed. We then find the magnetic nanomechanical forces generated by such structures.The conical synthetic antiferromagnetic nanoparticles with two magnetic layers -Left: the magnetic flux density is shown on the surface of the structure in a magnetic flux density of B ¼ 0.08 T. Middle and right: orientations of the magnetic moments of the two magnetic layers.

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“…The pinned layer in an SV can be replaced by a synthetic antiferromagnet (SAF) to reduce the magnetostatic interactions between the FM layers and increase the operating temperature range. An SAF consists of two FM layers coupled through a layer of Ru [ 13 , 14 , 15 ]. The thickness of the Ru layer (0.7–0.9 nm) corresponds to the maximum antiferromagnetic exchange interaction [ 16 ].…”

Section: Introductionmentioning

confidence: 99%

A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge

Milyaev,

Naumova,

Germizina

et al. 2024

Sensors

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Spin valves with a synthetic antiferromagnet were fabricated via magnetron sputtering. It was shown that the fabricated spin valve layers had a perfect microstructure and smooth interfaces, and therefore, an RKKY interaction dominated in the coupling of the ferromagnetic layers separated by a copper spacer. Rhombus-shaped micro-objects were fabricated from a single spin valve film. The thermomagnetic treatment procedure was found to form unidirectional anisotropy in the micro-object such that the values of the exchange bias fields in the rhombus’ nonparallel sides were opposite in sign. For the CoFeNi/Ru/CoFeNi synthetic antiferromagnet, we determined the differences between the ferromagnetic layer thicknesses at which the thermomagnetic treatment formed the same exchange bias all over each rhombus’ side. We also fabricated a sensor element in which each side of the rhombus was the shoulder of a Wheatstone bridge. After the thermomagnetic treatment procedure, each shoulder worked as an active magnetosensitive element, enabling the device to operate as a full Wheatstone bridge. The sensor output exhibited a step shape, high sensitivity to field changes, and significant magnetic hysteresis. Such characteristics are suitable for switching devices.

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On the control of spin flop in synthetic antiferromagnetic films

Cited by 16 publications

References 25 publications

Tunable linear magnetoresistance in MgO magnetic tunnel junction sensors using two pinned CoFeB electrodes

Tunable linear magnetoresistance in MgO magnetic tunnel junction sensors using two pinned CoFeB electrodes

The nano‐mechanics and magnetic properties of high moment synthetic antiferromagnetic particles

A Spin Valve-Based Rhombus-Shaped Micro-Object Implementing a Full Wheatstone Bridge

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