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Magnetic Damping

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...

Torque On A Current Loop In A Magnetic Field

Torque On A Current Loop In A Magnetic Field

The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...

Net Torque Calculations

Net Torque Calculations

When a mechanic tries to remove a hex nut with a wrench, it is easier if the force is applied at the farthest end of the wrench handle. The lever arm is the distance from the pivot point (the hex nut in this case) to the person’s hand. If this distance is large, the torque is higher. Only the component of the force perpendicular to the lever arm contributes to the torque. Therefore, pushing the wrench perpendicular to the lever arm is more advantageous. If multiple people apply force to...

Torque Free Motion

Torque Free Motion

The torque-free motion refers to the movement of a rigid body in space when no external torques are acting upon it. This type of motion can be observed in environments where there are no external forces or frictions, like in outer space. For example, a rotation of Mars in space is a torque-free motion. Mars is an axisymmetric object, meaning it has an axis of symmetry along which it rotates, designated as the z-axis. The rotating frame of reference is defined such that the center of mass of...

Thin-Walled Hollow Shafts

Thin-Walled Hollow Shafts

In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...

Angle of Twist: Problem Solving

Angle of Twist: Problem Solving

An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...

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Related Experiment Video

Updated: May 8, 2025

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

Published on: August 15, 2014

Strong Damping-Like Torques in Wafer-Scale MoTe Grown by MOCVD.

Stasiu T Chyczewski¹, Hanwool Lee¹, Shuchen Li²

¹Department of Electrical and Computer Engineering, The Grainger College of Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

ACS Applied Materials & Interfaces

|March 28, 2025

Summary

Researchers developed a scalable method for synthesizing 1T' Molybdenum Ditelluride (MoTe₂) using metal-organic chemical vapor deposition (MOCVD). This low-temperature process yields high-quality films crucial for advanced spintronic and magnetic devices.

Keywords:

MoTe2 metal−organic chemical vapor deposition spintronics transition metal dichalcogenide

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Microfabricated Post-Array-Detectors mPADs: an Approach to Isolate Mechanical Forces

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Last Updated: May 8, 2025

Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators

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Published on: August 15, 2014

Microfabricated Post-Array-Detectors mPADs: an Approach to Isolate Mechanical Forces

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Magnetic Tweezers for the Measurement of Twist and Torque

Magnetic Tweezers for the Measurement of Twist and Torque

Published on: May 19, 2014

Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Scalable synthesis of materials with strong spin-orbit coupling (SOC) is essential for advancing spintronic and magnetic devices.
1T' Molybdenum Ditelluride (MoTe₂) is a promising material due to its strong SOC properties.

Purpose of the Study:

To demonstrate wafer-scale synthesis of 1T' MoTe₂ at low temperatures using MOCVD.
To evaluate the material's compatibility with silicon back-end-of-line (BEOL) processes.
To confirm the strong spin-orbit coupling and spin-charge conversion efficiency of the synthesized MoTe₂.

Main Methods:

Wafer-scale growth of 1T' MoTe₂ via metal-organic chemical vapor deposition (MOCVD) at 400 °C.
Characterization of film uniformity and stoichiometry.
Spin torque ferromagnetic resonance (ST-FMR) measurements on a 1T' MoTe₂/permalloy bilayer.

Main Results:

Achieved uniform, stoichiometric wafer-scale 1T' MoTe₂ films at a low temperature of 400 °C.
Demonstrated compatibility with silicon back-end-of-line (BEOL) processes.
Confirmed strong spin-orbit coupling and high spin-charge conversion efficiency via ST-FMR, showing significant damping-like torques.

Conclusions:

Low-temperature MOCVD enables scalable synthesis of high-quality 1T' MoTe₂.
The material's properties are suitable for in-memory and in-sensor computing applications.
MOCVD-grown MoTe₂ shows significant potential for advanced spintronic and magnetic devices due to its strong SOC and BEOL compatibility.