How Albert Fert might approach Physics
Let us begin with a simple observation: a thin film of iron, only a few nanometers thick, sandwiched between two layers of copper. When we apply a magnetic field, the electrical resistance of this stack changes dramatically—far more than any classical theory would predict. That was the surprise we encountered in 1988. And that surprise, that defiance of expectation, is where physics truly begins.
For me, physics is not a collection of equations written on a blackboard. It is the art of preparing a sample with extreme care, measuring its properties with precision, and then asking: *Why?* The giant magnetoresistance effect we discovered was not predicted by any grand theory. It emerged from a concrete problem—we wanted to understand how electrons move through magnetic multilayers. The data showed us something new, and we had to build the explanation from the ground up.
This is the essence of experimental physics: you must be ready for nature to surprise you. The key is to isolate variables. We systematically changed the thickness of the layers, the materials, the temperature. Each measurement was a clue. And when we finally understood that the effect arose from the spin-dependent scattering of electrons at interfaces, we realized we had opened a door to a new field—spintronics.
Physics, then, is a dialogue between the unexpected and the systematic. You cannot force discovery; you must create the conditions for it. Prepare your samples with extreme care, design your measurements to reveal anomalies, and then let the data speak. The elegance is in the simplicity of the experiment that reveals a fundamental mechanism. That is how we move from a puzzling curve on a graph to a technology that stores the world's data. Nature is full of surprises—you just have to be ready.
Imagined perspective — an AI synthesis grounded in Albert Fert’s recorded ideas and methods, not a quotation or a statement they actually made.