Advanced Magnetic Materials for Energy and Power Conversion Applications: Developments in Magnetic Materials for Sensors and Data Storage
Sponsored by: TMS Functional Materials Division, TMS: Magnetic Materials Committee
Program Organizers: Daniel Salazar, BCMaterials; Alex Leary, NASA Glenn Research Center; Markus Chmielus, University of Pittsburgh; Ryan Ott, Ames Laboratory; Arcady Zhukov, University of the Basque Country
Monday 2:30 PM
February 24, 2020
Room: Del Mar
Location: Marriott Marquis Hotel
Session Chair: Paul Ohodnicki, University Of Pittsburgh; Ivan Skorvanek, Institute of Experimental Physics SAS
2:30 PM Invited
From Shapeable Magnetoelectronics to Soft Robotics with Embedded Magnetic Cognition: Denys Makarov1; 1Helmholtz-Zentrum Dresden-Rossendorf e.V.
Extending 2D structures into 3D space has become a general trend in multiple disciplines, including electronics, photonics, plasmonics and magnetics. This approach provides means to modify conventional or to launch novel functionalities by tailoring curvature and 3D shape. We explore the potential of these 3D magnetic architectures for the realization of mechanically shapeable magnetoelectronics [Makarov et al., Appl. Phys. Rev. 3, 011101 (2016)] for automotive applications [Melzer et al., Adv. Mater. 27, 1274 (2015)], point-of-care diagnostics [Lin et al., Lab Chip 14, 4050 (2014)], virtual and augmented reality appliances [Canon et al., Nature Electronics 1, 589 (2018) & Science Advances 4, eaao2623 (2018); Granell et al., npj Flexible Electronics 3, 3 (2019)]. Combining compliant magnetic field sensors with soft (magnetic) actuators allows realizing ultrafast soft robots with embedded cognition and feedback. These developments pave the way towards intelligent soft robots, autonomous and responsive soft devices, and novel human-machine interfaces.
2:55 PM Invited
Soft Magnetic Amorphous and Nanocrystalline Bilayer Ribbons for GMI Sensors: Ivan Skorvanek1; Frantisek Andrejka1; Branislav Kunca1; Jozef Marcin1; Peter Svec2; 1Institute of Experimental Physics Sas; 2Institute of Physics SAS
Amorphous and nanocrystalline bilayer ribbons showing giant magnetoimpedance effect (GMI) can be used in design of magnetic sensors. Strategies for enhancement of their sensor performance include utilization of new alloys and/or novel geometries, better control of microstructure and improved processing methods. We show that besides the effects of field-annealing, the magnetic behavior in such bilayers is strongly influenced by interlayer stresses, which are induced in material due to different thermal expansion of two mechanically solid connected layers. The effects of magnetostatic interaction between layers can also play an important role in magnetization reversal process. Examples of our recent work on development of soft magnetic bilayer ribbons with enhanced magnetoimpedance characteristics will be presented and the application potential of such materials for use in magnetic sensors will be briefly discussed. This work was supported by the projects VEGA 2/0171/19, JRP SAS-TUBITAK MAGSAT and APVV-15-0621.
3:20 PM
Ferromagnetic Transition Metal Selenides for Spintronics: Pierre Poudeu1; 1University of Michigan
Spintronic devices offer benefits in power efficiency and size reduction over current electronics, but require the development of semiconductor materials with favorable magnetic properties. The discovery of p-type and n-type ferromagnetic semiconductors (p-FMSs, n-FMSs) exhibiting high electrical conductivity and Curie temperature (Tc) above 300 K would dramatically improve semiconductor spintronics and pave the way for the fabrication of spin-based semiconducting devices. Here, we show that decoupling both functional sublattices in a low-symmetry semiconductor MPn2Se4 (M = Mn, Fe; Pn = Sb, Bi) enables unprecedented coexistence of high n-type (Pn = Bi) and p-type (Pn = Sb) electrical conduction and ferromagnetism (M = Fe) with Tc=450 K. Our results demonstrate that decoupling magnetic and semiconducting sublattices allows access to high-Tc n-FMSs and p-FMSs as well as helps unveil the mechanism of carrier-mediated ferromagnetism in spintronic materials. The realization of high-Tc n-FMSs and p-FMSs should enable spin-based semiconducting devices.
3:40 PM
Engineering of Magnetic Properties of Co-rich Microwires by Post-processing: Lorena Gonzalez-Legarreta1; Valentina Zhukova1; Paula Corte-Leon2; Mihail Ipatov1; Juan Blanco3; Arcady Zhukov4; 1Dept. Phys.Mater, Univ. Basque Country; 2University. Basque Country; 3Dept. Appl. Phys., Univ. Basque Country; 4UPV/EHU, and Ikerbasque, Basque Foundation for Science
Magnetic microwires exhibiting excellent magnetic and mechanical properties are extremely demanded by industries [1,2]. We present our results on tailoring of magnetic properties and giant magnetoimpedance (GMI) effect of Co-rich glass-coated microwires by conventional annealing and stress-annealing at temperatures from 200 up to 375 oC. Considerable coercivity, Hc, increase and transformation of hysteresis loops from linear to rectangular are observed upon conventional annealing. Despite that the stress-annealed microwires also present rectangular hysteresis loops, the Hc –values of such microwires are considerably lower than that of annealed without stress. We also observed an increase of GMI ratio in annealed and stress-annealed microwires as compared to as-prepared microwires. In annealed and stress-annealed samples presenting rectangular hysteresis loops we observed the single DW propagation. The DW velocity, v, and DW mobility, S, depend on annealing conditions. At certain annealing conditions we observed v up to 4 km/s and S up to 29 m2/sA.
4:00 PM Break
4:20 PM Invited
High-performance Amorphous Wire Magneto-impedance Sensor for Biomagnetic Field Detection: Tsuyoshi Uchiyama1; Jiaju Ma1; 1Nagoya University
We have constituted highly sensitive linear micro magnetic field sensors utilizing Off-diagonal Magneto-Impedance (MI) effect. Recently we have succeeded in producing pico-Tesla (10-8Oe) resolution MI sensors due to ultra-low intrinsic magnetic noise of amorphous wire. Superconducting quantum interference deice (SQUID) have ultrasensitive, which have been utilized for bio-magnetic signals. For example, magnetocardiography (MCG) is a noninvasive technology that measures the magnetic field of the heart. The SQUIDs have been also used to measure human brain.We have successfully measure MCG signal using a precise MI gradiometer. The gradiometer tested as magnetoencephalogram detectors as well. The spontaneous brain activity (Alpha rhythm) measurements were carried out on several subjects. As expected, the alpha rhythm signals simultaneously measured by EEG and MI gradiometer were significantly attenuated when the subject opens eyes and then intensified with eyes close.
4:45 PM Invited
Electrochemical Polishing of Thin Metallic Glass Ribbons: Ferenc Zamborszky1; Eva Fazakas2; Elek Csizmadia1; Mark Kovacs1; 1Magnetec-Ungarn Kft.; 2Budapest University of Technology and Economics
Soft magnetic inductive components with low power losses are forming the vital part of modern power electronic and electrotechnical equipment such like wind turbines, solar inverters, industrial drives and vehicles. Ribbons of thin metallic glass produced by planar flow casting and annealed into nanocrystalline structure are successful in achieving superb properties like ultralow coercitive force (Hc ~ 1 A/m), wide range of adjustable relative permeability (r ~ 1 000 – 200 000) and wide operational temperature range (Top ~ 77 – 473 K). In this report we present investigations on electrochemically polished ribbons. Reduction of surface roughness from 1 – 2 m to 200 – 400 nm was revealed by atomic force microscopy. Small core samples made of the ribbons were annealed in transversal magnetic field. Frequency dependence of complex permeability and power losses of these samples confirm that electrochemical polishing did not cause deterioration of the soft magnetic properties.
5:10 PM Invited
The Invention of On-ASIC Type GSR Sensor Excited by GHz Pulse Current: Yoshinobu Honkura1; S. Honkura2; 1Magnedesign Corporation; 2Nanocoil Incorporation
GMI effect shows the maximum sensitivity at the frequency of 200 MHz [1]. We have studied the effect of the frequency on the sensitivity using a micro coil GMI element. We found interesting results that the coil voltage increases with increase of the frequency up to the frequency of 3GHz. We also found at the frequency of 2GHz the mathematical relationship between the magnetic field and coil voltage shows sine wave function as VVo siniπH/‚QHmj. We named this new phenomena excited by GHz pulse current as GHz-Spin-Rotation effect[2] and developed on-ASIC type GSR sensor which has the GSR element directly formed on the ASIC. This small size type GSR sensors will be applicable to catheter use. [1] A.Zhukov etc.: Proceedings of 8th international Conference on Sensing Technolog,Sep.2-4. (2014)[2] Y.Honkura: United States Patent No: US 9,857,436 B2, Jan. 2, 2018
5:35 PM Cancelled
A Study of Processing High-grade Magnetite Concentrates by Combination of Magnetic Separation and Reverse Flotation Separation to Prepare Raw Materials for Ferrite Magnet: Bin Xu1; Yujuan Zhou1; Yongpeng Ma1; Jintian Wu1; Tao Jiang1; 1Central South University
Permanent magnets (PM) are critical components for electric motors and power generators. Non-rare earth (non-RE) PMs typically have small supply risks and low cost compared to Rare Earth Element (REE) PMs. There is a try to purify super high-grade magnetic concentrate to prepare raw materials for ferrite magnet of non-RE PMs. Beneficiation of a high-grade (68%) iron ore concentrate was investigated by combination of the low-intensity magnetic separation and reverse flotation methods. The granulometric composition was determined by laser particle size analyzer. Element analysis was assessed by semiquantitative XRF analysis, and mineralogical composition was evaluated by powder X-ray diffraction. The effects of the magnetic field intensity during magnetic separation was investigated on the performance of the wet low-intensity magnetic separation (WLIMS). The optimum flotation conditions of starch as depressant were determined. With the combination of magnetic separation and reverse flotation separation, product of >72% Fe and <0.2% silicate grade was produced for preparing ferrite magnet.