Typical Physical Properties and Performance Characteristics
Note: The following technical information and data should be considered representative or typical only and should not be used
for specification purposes.
Surface Resistivity (Top/Bottom Side) Min. 1 x 10
5
Ω
Maximum Permeability* 80,000
Magnetic Flux Density* Min. 1.3 T
Temperature Range -25~110°C
(2)
*These values are measured with a Torodial shaped sample: 3M test method.
Application Ideas
The 3M™ Flux Field Directional Material (FFDM) EM80KM is a magnetic material designed to interact and influence an
Electro-Magnetic (EM) field. The EM field could be generated for various reasons and in many applications it is desired to
focus the EM field across a specific volumetric area, such as a secondary EM field pick-up coil or antenna.
The 3M FFDM material is designed to efficiently couple to the EM field and redirect and focus the field as desired in a
given application.
The 3M FFDM material performance is based on several application considerations:
1) Permeability of the 3M FFDM material at the frequency range or frequency peak of the intended application can affect
the performance. Permeability of the 3M FFDM material varies with frequency and is a measure of how well the EM
material may couple with the EM field and impact performance.
2) Thickness of the 3M FFDM product. Single or multi-layer designs can be used to optimize an application’s performance.
3) End use application orientation and location affects the 3M EM product’s interaction with an EM field.
As an initial design, it is suggested to test the 3M FFDM product at the greatest thickness allowed (1x, 2x, 3x layers, etc.),
largest XY dimension, multiple locations or multiple parts to determine a potential maximum performance level associated
with the material. Once a baseline level of performance is established, the 3M FFDM material thickness, XY shape,
location, etc. can be reduced or changed to determine the minimum material needed to meet a specification. The desire to
test first the 3M FFDM with the thickest and/or largest footprint design is to establish that an FFDM material solution is
reasonable and also to understand a maximum associated performance. After an acceptable level of performance has been
demonstrated through use of the FFDM, it is also suggested that the designer consider that other article design changes
could now be considered because of the use of the FFDM. Other article design change could include overall thinner/
smaller designs, improved end product target specifications, etc.
The 3M FFDM EM80KM has potential to be used for:
• Shield DC and low frequency magnetic field.
• Wireless power system power transfer efficiency improvement
• Potential devices include mobile phone, computers, tablets, measurement and sensor
• Protect magnetic flux sensitive device such as hall sensor and flux gate from external low frequency magnetic field
• Assembly of magnet coil for wireless charging system
• Electronic equipment protection for automobile applications
• 3M EM80KM FFDM has low loss around 100kHz
• 3M EM80KM FFDM has higher eddy current losses around 200kHz
3M
™
Flux Field Directional Material EM80KM-xxx-1
