TDK MA-X

Magnetic Particle: Finavix

Coercivity: 1130 Oe
Remanence: 3300 Gauss
Squareness Ratio: 0.85

Operating Bias: +0.5dB
MOL 315Hz: +6.0dB
MOL 10kHz: +0.5dB
Sensitivity at 315Hz: +1.2dB
Sensitivity at 3.15kHz: +1.8dB
Sensitivity at 10kHz: +2.5dB
Sensitivity at 16kHz: +3.0dB
Bias Noise: -58.0dB

The formulation is based on Finavix particle. It appreared first around 1985.