Overview
Fritz Pfleumer (1881–1945) patented magnetic recording tape in 1928: iron oxide powder bonded to a strip of paper, later plastic. It replaced Poulsen's steel wire with something light, cheap, splicable and editable. AEG licensed the patent and built the Magnetophon around it, and every tape format down to the cassette and videotape descends from the idea.
What You Need
- Lived: 1881–1945, Germany, born in Austria
- Anchor year: 1928 — the magnetic tape patent
- Strand: overlooked
Steps
The problem as it stood
Magnetic recording had existed since Poulsen in 1898 and had gone nowhere. Steel wire and steel tape were heavy, expensive, prone to snapping, dangerous at speed and effectively impossible to edit — a broken wire had to be welded.
What he actually did
Pfleumer, who had worked on applying metallic coatings to paper for cigarette tips, applied the same thinking to recording: bond finely divided magnetic material to a flexible non-magnetic carrier. The magnetic medium becomes a thin coating rather than the substrate itself.
How it worked
Only the surface of a steel wire participates usefully in recording anyway, so the bulk of the metal is dead weight. A thin oxide coating on paper or plastic gives the same magnetic behaviour with almost none of the mass, and the carrier can be cut with scissors and joined with adhesive — which is what makes editing possible.
What it made possible
AEG's Magnetophon, and from there the entire tape era: broadcast recording, multitrack music production, the compact cassette, and videotape. Editability alone transformed radio production, because a programme could be assembled rather than performed.
What happened to him
He licensed the patent to AEG, which developed the machines while BASF developed the tape. His patent was later challenged in Germany on the grounds that coating a carrier was already known. He died in 1945.
Where the credit landed
Magnetic tape recording was developed in Germany — Fritz Pfleumer devised the coated tape in 1928, AEG and BASF built the Magnetophon around it through the 1930s, and Walter Weber established AC bias around 1940. Jack Mullin brought captured machines to America after the war. The persistent claim that Bing Crosby invented or funded the invention of tape is false: Crosby was an early and important adopter who backed Ampex, which is a different thing.
Pro Tips
- Only the surface of a wire records — the rest is dead weight.
- Splicing with scissors and tape is what made editing possible.
- "Bing Crosby invented tape" is false; he was an important adopter and backer.
Knowledge Base
What You'll Learn
The move from wire to coated tape is what made magnetic recording a production tool rather than a curiosity.
Why editability changed broadcasting
Before tape, a radio programme was either live or cut to disc, and a disc cannot be edited. Tape can be cut and rejoined, so a programme could be assembled from takes, mistakes removed, and items reordered. That changed what radio could be — from a performance to a constructed object — and the same change arrived in television only when videotape did in 1956.
Where This Fits
This guide covers one specific part of the history of media technology. The wider picture — how each link in the chain from capture through transmission to display was actually built, who built it, and why the credit so often landed somewhere else — is in A History of Broadcast Technology: The Chain From Capture to Screen, which frames the discipline as a whole and links out to the detailed guides underneath it, including this one. If you are starting from scratch rather than solving a specific problem, read that first and come back here.
FAQ
Q: Who invented magnetic tape?
A: Fritz Pfleumer patented coated magnetic tape in 1928, building on Valdemar Poulsen's 1898 magnetic wire recording. AEG and BASF developed it into the Magnetophon through the 1930s.
Q: Did Bing Crosby invent tape recording?
A: No. Crosby was an early adopter who used tape to pre-record his radio show and invested in Ampex, which was commercially significant but is not invention.