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Meeting 2024 TMS Annual Meeting & Exhibition
Symposium Advanced Soft Magnets and Magnetocaloric Materials: An FMD Symposium in Honor of Victorino Franco
Presentation Title A Solution to the Permalloy Problem
Author(s) Ananya Balakrishna
On-Site Speaker (Planned) Ananya Balakrishna
Abstract Scope In 1914, a magnetic alloy (now known as the Fe-Ni permalloy) with unusually high magnetic permeability and low hysteresis was discovered at the Bell Telephone Laboratories. Several researchers have attributed this unusual behavior of the permalloy to the small anisotropy constant, however, there are several outliers (e.g., Fe-45Ni has small hysteresis despite large anisotropy constant, similar observation is noted for Sendust alloys), and this theory that dot not explain the complete story of magnetic hysteresis. In a departure from prior work, we hypothesize that a combination of a large local disturbance (needle microstructure) and material constants contributes to the drastic decrease in hysteresis in magnetic alloys. We recently developed a nonlinear framework based on the micromagnetics theory to test this hypothesis, and our findings provide insights into the longstanding permalloy problem and suggest a new mathematical relationship between material constants for which magnetic hysteresis is minimum.
Proceedings Inclusion? Planned:
Keywords Magnetic Materials, Modeling and Simulation,

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

4f-electrons Driven Giant Magnetic and Optical Anisotropy in Site-substituted M-type Strontium-hexaferrite
A Bright Future for Magnetocaloric High-entropy Alloys
A Solution to the Permalloy Problem
Advancements in the Development of Magnetic Refrigerators Operating at Near Room Temperature
Advances in Additive Manufacturing of Metamagnetic Shape Memory Alloys for Magnetocaloric Applications
An Overview of Soft Magnetic Properties of Fe-based Alloys by Rapid Solidification and Additive Manufacturing for Sustainable Applications
Assessing Rapid Solidification Processing to Produce Magnetocaloric Alloys for Gas Liquefaction
Connecting Soft Magnetic Core Performance to Power Converter Design
Effective Evaluation Setups for the Real Cooling Performance of Magnetocaloric Materials
Entropy Change at a Demagnetization Broadened First Order Transition
Essential Perspective on Magnetic and Thermodynamical States of Fe-based Magnetocaloric Compounds Inside the AMR-type Module
Evaluation of Martensite Transformation Temperatures Using Magnetometry
Evidence of Large Cryogenic Magnetocaloric Effect in GdNi1-xCox (0 ≤ x ≤ 0.15)
Fe Based Magnetic Carbon Composites
Induced Magnetic Anisotropy in Soft Magnetic Nanocomposites: A Review and Recent Insights
Machine Learning Assisted Development of Magnetocaloric Materials
Magnetic and Magnetocaloric Properties of R2In Intermetallic Compounds with Reversible First-order Transformations
Magnetic Field Suppression of the Martensitic Transition in NiMn-based Metamagnetic Shape Memory Heusler Compounds
Magnetic Materials for Energy Efficient Applications: Studying Materials Out of Their Comfort Zone
Magneto-optics, Revisited
Magnetocaloric Composite Wires for Regenerators
Magnetocaloric Effect in Amorphous and Nanocomposite Alloys
Magnetocaloric Materials for the Liquefaction of Hhydrogen
Magnetoelastic Coupling Transition Behavior in (Mn,Ni,Fe)2(P,Si) Alloys
Metal Amorphous Nanocomposite (MANC) Materials for High High Speed Axial Motors
Multi-caloric Experimental Investigation of FeSMA and MetaSMA Materials NiMn-based: Cast Alloys, Sintered Samples and Melt Spun Ribbons
Nanoscale Phase Separation in Rare-earth Containing Magnetocaloric Compounds
The Proposed Minimum Efficiency Standards for Distribution Transformers and the Impact to the Supply of Electrical and Amorphous Steels
Thermal First Order Reversal Curves (TFORC) measurements and properties of (NiMnSi)0.66(Fe2Ge)0.34 alloy
Tuning Magnetic Materials with Stress and Electric Field

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